MATH 102 Calculus 1: Evaluating Limits
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Questions and Answers

What is the result of evaluating the limit: $\lim_{x \to 1} (x^3 + 2x^2 - 3x + 4)$?

  • 9
  • 8 (correct)
  • 7
  • 6
  • Given the limit $\lim_{x \to 1} (x^3 + 2x^2 - 3x + 4)$, what operation is primarily used to evaluate this limit?

  • L'Hôpital's Rule
  • Factoring
  • Partial fraction decomposition
  • Direct substitution (correct)
  • Using the evaluation method demonstrated, what is the first step in finding $\lim_{x \to 1} (x^3 + 2x^2 - 3x + 4)$?

  • Substitute x = 1 into the polynomial. (correct)
  • Differentiate the polynomial
  • Manipulate the polynomial
  • Factor the polynomial
  • Based on the example provided, if we were to evaluate $\lim_{x \to 2} (x^3 + 2x^2 - 3x + 4)$, what would be the direct substituted expression?

    <p>$(2)^3 + 2(2)^2 - 3(2) + 4$ (D)</p> Signup and view all the answers

    In the limit example $\lim_{x \to 1} (x^3 + 2x^2 - 3x + 4)$, what is the exponent of the highest degree term?

    <p>3 (C)</p> Signup and view all the answers

    Given that $\lim_{x \to c} f(x) = 2$, $\lim_{x \to c} g(x) = 1$, and $\lim_{x \to c} h(x) = \frac{1}{2}$, what is the value of $\lim_{x \to c} (h(x))^2$?

    <p>1/4 (A)</p> Signup and view all the answers

    Given that $\lim_{x \to c} f(x) = 2$, $\lim_{x \to c} g(x) = 1$, and $\lim_{x \to c} h(x) = \frac{1}{2}$, what is the value of $\lim_{x \to c} [(h(x))^3 - 3]^2$?

    <p>16 (D)</p> Signup and view all the answers

    If $\lim_{x \to c} f(x) = 2$, $\lim_{x \to c} g(x) = 1$, and $\lim_{x \to c} h(x) = \frac{1}{2}$, what is the result of calculating $\lim_{x\to c} \frac{f(x)}{g(x)}$?

    <p>2 (C)</p> Signup and view all the answers

    Given $\lim_{x \to c} f(x) = 2$, $\lim_{x \to c} g(x) = 1$, and $\lim_{x \to c} h(x) = \frac{1}{2}$, find the limit of $\lim_{x \to c} [f(x) + g(x)]$.

    <p>3 (B)</p> Signup and view all the answers

    Using the given limits $\lim_{x \to c} f(x) = 2$, $\lim_{x \to c} g(x) = 1$, and $\lim_{x \to c} h(x) = \frac{1}{2}$, what is the value of $\lim_{x \to c} [f(x) \cdot g(x) \cdot h(x)]$?

    <p>1 (A)</p> Signup and view all the answers

    What is the value of the limit expression shown as $\frac{4(3) + 3}{2} - \frac{0}{2}$?

    <p>7.5 (C)</p> Signup and view all the answers

    What is the result when the limit expression $\frac{(-1)^3 + (-1)}{1}$ is evaluated?

    <p>-2 (C)</p> Signup and view all the answers

    Given the limit expression of $\frac{1}{1} - \frac{1}{1}$ , what is its value?

    <p>0 (D)</p> Signup and view all the answers

    What is produced by the limit expression $\frac{1}{1} - \frac{1}{0}$?

    <p>Undefined (A)</p> Signup and view all the answers

    The expression $\lim_{b\to -1} \frac{1}{b+1}$ evaluates to?

    <p>Undefined (D)</p> Signup and view all the answers

    What does the limit expression $\lim_{b \to -1} \frac{1}{(b+1)}$ evaluate to?

    <p>$\infty$ (A)</p> Signup and view all the answers

    The expression $\frac{1}{1} - \frac{1}{-1}$ evaluates to which of the following?

    <p>2 (A)</p> Signup and view all the answers

    Given the limit expression $\lim_{b \to -1} \frac{1}{b^2 - 1}$, what does it resolve to?

    <p>Undefined (A)</p> Signup and view all the answers

    Given that $\lim_{x\to c} f(x) = 2$, $\lim_{x\to c} g(x) = 1$, and $\lim_{x\to c} h(x) = 1$, what is the value of $\lim_{x\to c} [5f(x) - g(x) + 2h(x)]$?

    <p>13 (C)</p> Signup and view all the answers

    Given that $\lim_{x\to c} f(x) = 2$, $\lim_{x\to c} g(x) = 1$, and $\lim_{x\to c} h(x) = 1$, what does $\lim_{x\to c} \frac{g(x) + f(x)}{h(x)}$ evaluate to?

    <p>3 (A)</p> Signup and view all the answers

    Given the limit rules, what is the result of $\lim_{x\to a} [f(x)]^n$ if $\lim_{x\to a} f(x) = L$?

    <p>$L^n$ (D)</p> Signup and view all the answers

    If $\lim_{x\to a} f(x) = L$, under what condition is $\lim_{x\to a} \sqrt[n]{f(x)} = \sqrt[n]{L}$ valid, assuming $n > 1$ and $n$ is a natural number?

    <p>When n is odd or when, if n is even, L &gt; 0. (B)</p> Signup and view all the answers

    Given $\lim_{x\to c} f(x) = 2$, what is the value of $\lim_{x\to c} \sqrt{3f(x)}$?

    <p>$\sqrt{6}$ (B)</p> Signup and view all the answers

    Given that $\lim_{x\to c} f(x) = 2$, $\lim_{x\to c} g(x) = 1$, and $\lim_{x\to c} h(x) = 1$, what is the value of $\lim_{x\to c} \frac{h(x)}{g(x)}$?

    <p>1 (A)</p> Signup and view all the answers

    If $\lim_{x\to a} f(x) = L$ and given the limit laws, what is the value of $\lim_{x\to a} 5f(x)$?

    <p>$5L$ (A)</p> Signup and view all the answers

    Given $\lim_{x\to c} f(x) = 2$, what is the value of $\lim_{x\to c} [f(x)]^2$?

    <p>4 (B)</p> Signup and view all the answers

    What is the limit of the function $f(x) = x^2 + 2x - 1$ as $x$ approaches 3?

    <p>14 (C)</p> Signup and view all the answers

    Given $h(x) = \frac{x^2 + 1}{x + 2}$, what is $\lim_{x \to 1} h(x)$?

    <p>2/3 (D)</p> Signup and view all the answers

    Consider the function $f(x) = 3x^3 - 2x^2 + x - 5$. What is $\lim_{x \to -1} f(x)$?

    <p>-11 (A)</p> Signup and view all the answers

    For the rational function $r(x) = \frac{x+5}{x^2 + 4}$ what is the value of $\lim_{x \to 2} r(x)$?

    <p>7/8 (B)</p> Signup and view all the answers

    If $f(x) = x^4 - 2x^3 + 5x - 1$, what is $\lim_{x \to 0} f(x)$?

    <p>-1 (B)</p> Signup and view all the answers

    Given the function $g(x) = \frac{2x^2-3}{x+5}$, what is $\lim_{x \to -1} g(x)$?

    <p>-5/4 (C)</p> Signup and view all the answers

    Evaluate $\lim_{x \to -2} (3x^2 - 5x + 2)$.

    <p>24 (C)</p> Signup and view all the answers

    Using the function $f(x) = \frac{x^2 - 4}{x+1}$, what is the value of $\lim_{x \to 3} f(x)$?

    <p>5/4 (D)</p> Signup and view all the answers

    What is typically the first step in evaluating a limit expression?

    <p>Direct substitution of the limit value (B)</p> Signup and view all the answers

    Which of the following is a key property of limits when factors are involved?

    <p>Products of limits equal the limit of products (D)</p> Signup and view all the answers

    When evaluating the limit $ rac{(a + b)(a - b)}{a^2 - b^2}$, what can effectively simplify the expression?

    <p>Recognizing the difference of squares (C)</p> Signup and view all the answers

    What result do you achieve when substituting values that yield an indeterminate form like $ rac{0}{0}$ during limit evaluation?

    <p>A different technique, such as factoring, may need to be applied (D)</p> Signup and view all the answers

    If given the function limits $ rac{f(x)}{g(x)}$, under what condition can limits be directly divided?

    <p>If the limit of g(x) is non-zero (B)</p> Signup and view all the answers

    Which of the following expressions exemplifies the use of evaluating limits through substitution?

    <p>$ rac{(x^3 - 8)}{(x - 2)}$ where $x o 2$ (A)</p> Signup and view all the answers

    What form does the limit $ rac{a^2 - b^2}{a - b}$ typically take before simplifying?

    <p>Indeterminate form $ rac{0}{0}$ (B)</p> Signup and view all the answers

    When evaluating a limit that leads to an indeterminate form, what is a common method for resolution?

    <p>Applying L'Hopital's rule (C)</p> Signup and view all the answers

    Flashcards

    Limit of a function

    The value that a function approaches as the input approaches a specific point.

    Evaluating limits

    The process of finding the limit of a function as it approaches a certain point.

    Substitution in limits

    Replacing the variable with a specific value to find the limit.

    Indeterminate form

    A condition (like 0/0) indicating that further analysis is needed to evaluate a limit.

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    Polynomial limits

    Limits involving polynomial functions which can often be simplified using algebraic techniques.

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    Limit of Power

    lim [f(x)]^n = (lim f(x))^n as x approaches a.

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    Limit of Root

    lim n√f(x) = n lim f(x) as x approaches a, given lim f(x) > 0 for even n.

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    Given Limits

    Using provided limits to compute new limits: lim f(x)=2, lim g(x)=1, lim h(x)=1.

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    Limit Calculation Example 1

    lim [5f(x)g(x) + 2h(x)] as x approaches c leads to substituting given limits.

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    Limit Calculation Example 2

    Limiting behavior example with complex fractions and functions to compute.

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    Limit of a Sum

    The sum of limits: lim [f(x) + g(x)] = lim f(x) + lim g(x).

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    Final Limit Evaluation

    Final computed value from limit functions indicates behavior near a point.

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    Limit of f(x)

    The value that f(x) approaches as x approaches c, specifically 2.

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    Limit of g(x)

    The value that g(x) approaches as x approaches c, specifically 1.

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    Limit of h(x)

    The value that h(x) approaches as x approaches c, specifically 1.

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    Limit of (h(x))^2

    The limit as x approaches c of h(x) squared, resulting in 1.

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    Limit of [(h(x))^3 - 3]^2

    The limit as x approaches c of the expression, resulting in 16.

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    Polynomial function

    A function defined as f(x) = an x^n + an-1 x^(n-1) + ... + a0.

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    Evaluating limits of polynomials

    lim f(x) as x approaches a equals f(a) for polynomials.

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    Rational function limit

    For h(x) = f(x)/g(x), lim h(x) = lim f(x)/lim g(x) if g(a) ≠ 0.

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    Limit notation

    lim x→a f(x) indicates limit as x approaches a.

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    Special limits at infinity

    Limits can also be evaluated as x approaches infinity.

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    Limit laws

    Rules that allow calculation of limits based on operations.

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    Continuity and limits

    A function is continuous if limit equals function value at a point.

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    Limit

    The value that a function approaches as the input approaches a specified point.

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    Zero Limit Example

    A limit where the function approaches zero as the input approaches a specific value.

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    Combining Fractions

    The method of adding or subtracting fractions by finding a common denominator.

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    The Factorization Method

    A technique used to simplify limits by factoring expressions.

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    Approaching Behavior

    How a function behaves near a specific point but not necessarily at that point.

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    Substitution

    A method used in evaluating limits where you directly substitute the value into the function.

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    Evaluating limits at a point

    Finding the limit of a function as it approaches a specific value.

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    Sum of limits

    The limit of the sum of two functions equals the sum of their limits.

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    Difference of limits

    The limit of the difference of two functions equals the difference of their limits.

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    Product of limits

    The limit of the product of two functions equals the product of their limits.

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    Quotient of limits

    The limit of the quotient of two functions equals the quotient of their limits, if the limit of the denominator is not zero.

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    Algebraic manipulation in limits

    Using algebraic techniques to simplify expressions before finding limits.

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    Evaluating limits with substitution

    Using direct substitution to evaluate limits when possible.

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    Study Notes

    Course Information

    • Course Title: MATH 102 CALCULUS 1
    • Department: Department of Mathematics
    • College: College of Science
    • University: Polytechnic University of the Philippines
    • Location: Sta. Mesa, Manila

    Evaluating Limits: Outline

    • Limit Theorems
    • Evaluating Limits

    Evaluating Limits: Limit Theorems

    • Uniqueness of Limits: If the limit of a function exists, it's unique. If the limit from the left and right equal different values, the limit does not exist.
    • Limit of a Constant: The limit of a constant (c) as x approaches any value (a) is just the constant (c).
    • Limit of Identity Function: The limit of the identity function (f(x) = x) as x approaches a value (a) is just that value (a).
    • Limit of Sum and Difference: The limit of a sum or difference of functions is the sum or difference of the limits.
    • Limit of Product: The limit of a product of two functions is the product of the limits of the functions.
    • Limit of a Quotient: The limit of the quotient of two functions (f(x)/g(x)) is the quotient, of the limits provided the limit of the denominator is not zero.
    • Limits of Power: The limit of a function raised to a power 'n' is the limit of the function raised to the same power('n').
    • Limit of Root: The limit of the nth root of a function is the nth root of the limit of the function under the condition specified that when 'n' is even, lim f(x) ≥ 0 as 'x' approaches 'a'.

    Evaluating Limits: Examples

    • Provided numerous examples of evaluating limits using the above theorems
    • Includes specific examples showing how to compute limits for a variety of functions.
    • Covers scenarios where limits may take indeterminate forms, requiring further manipulation.
    • Demonstrates solutions for limits of polynomial and rational functions at specific points.
    • Includes methods for resolving cases of indeterminate form, such as factoring and rationalizing.

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    Description

    This quiz covers the fundamental limit theorems and techniques for evaluating limits in calculus. Students will explore the uniqueness of limits, limits of constants, identity functions, and operations involving sums, differences, products, and quotients. Test your understanding of these key concepts in calculus!

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