GE1703 Curve Sketching Minimums and Maximums: Definition 4.1

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Questions and Answers

What is a relative maximum value of a function?

  • The value at which the function has a zero derivative
  • The value at which the function does not exist
  • The value at which the function reaches its highest point in the given interval (correct)
  • The value at which the function reaches its lowest point in the given interval

What is a relative minimum value of a function?

  • The value at which the function reaches its highest point in the given interval
  • The value at which the function has a zero derivative
  • The value at which the function reaches its lowest point in the given interval (correct)
  • The value at which the function does not exist

When is a number considered to be a relative extremum value of a function?

  • When the function has a zero derivative at that number
  • When the function has a non-existent derivative at that number
  • When the function reaches its maximum or minimum value at that number (correct)
  • When the function does not exist at that number

According to Theorem 4.1, if 𝑓𝑓(𝑐𝑐) is a relative extremum value, what is the value of 𝑓𝑓’(𝑐𝑐)?

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

What is a critical value of a function?

<p>A value where the derivative of the function is zero or non-existent (D)</p> Signup and view all the answers

In Example: Find the critical values of 𝑓𝑓(𝑥𝑥) = $𝑥^3 - 3𝑥^2 - 9𝑥 + 1$, what are the critical values?

<p>$-1$, $3$ (D)</p> Signup and view all the answers

What is the first derivative of the function 𝑓(𝑥) = $3𝑥^2 - 6𝑥 - 9$?

<p>$6𝑥 - 6$ (A)</p> Signup and view all the answers

Which of the following is a critical value of the function 𝑓(𝑥) = $3𝑥^2 - 6𝑥 - 9$?

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

What is the derivative of the absolute value function 𝑔(𝑥) = |𝑥|?

<p>It does not exist (D)</p> Signup and view all the answers

For what value of 𝑐 is the absolute value function 𝑔(𝑥) = |𝑥| not differentiable?

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

According to Theorem 4.2, when does a function have an absolute maximum and an absolute minimum?

<p>When it is continuous on a closed interval (A)</p> Signup and view all the answers

What type of function is 𝑓(𝑥) = $3𝑥^2 - 6𝑥 - 9$ on the interval [a, b] if 𝑓'(𝑥) ≥ 0 for all 𝑥 in (a, b)?

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

If 𝑓′(𝑥) ≤ 0 for all 𝑥 in (a, b), what type of function is 𝑓(𝑥) = $3𝑥^2 - 6𝑥 - 9$ on the interval [a, b]?

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

In Theorem 4.4, if 𝑓′(𝑥) ≥ 0 as 𝑥 approaches 𝑐 from the left and 𝑓′(𝑥) ≤ 0 as 𝑥 approaches 𝑐 from the right, what can be concluded about 𝑓(𝑐)?

<p>It's a relative maximum value (B)</p> Signup and view all the answers

What does Theorem 4.3 state about the behavior of a function when its first derivative is always non-negative on an interval?

<p>It's increasing on that interval (D)</p> Signup and view all the answers

When does a number qualify as an absolute extremum value on an interval?

<p>When it's either an absolute maximum or an absolute minimum (A)</p> Signup and view all the answers

What type of function is defined as strictly increasing on an interval if its values consistently increase and never decrease?

<p>A strictly increasing function (B)</p> Signup and view all the answers

If a function’s values consistently decrease as the input values increase, what type of function is it described as?

<p>A strictly decreasing function (A)</p> Signup and view all the answers

What is the domain of the function $f(x) = an(x)$?

<p>${x | x \neq k\pi, k \in \mathbb{Z}}$ (C)</p> Signup and view all the answers

What is the range of the function $f(x) = \sqrt{x}$?

<p>$[0, +\infty)$ (A)</p> Signup and view all the answers

Which function is defined on the interval $(0, +\infty)$?

<p>$f(x) = e^x$ (D)</p> Signup and view all the answers

What is the domain of the function $f(x) = \frac{1}{x}$?

<p>$x \neq 0$ (D)</p> Signup and view all the answers

What is the range of the function $f(x) = \ln(x)$?

<p>$(-\infty, -1] \cup [1, +\infty)$ (B)</p> Signup and view all the answers

Which function has a range of $(-\infty, -1] \cup [1, +\infty)$?

<p>$f(x) = e^x$ (A)</p> Signup and view all the answers

What is the domain of the function $f(x) = \sqrt{x}$?

<p>$[0, +\infty)$ (B)</p> Signup and view all the answers

Which function has a range of $[0, +\infty)$?

<p>$f(x) = e^x$ (B)</p> Signup and view all the answers

What is the domain of the function $f(x) = 2^x$?

<p>$[0, +\infty)$ (A)</p> Signup and view all the answers

Which function is defined on the interval $(-\infty,-1] \cup [1,+\infty)$?

<p>$f(x) = e^x$ (D)</p> Signup and view all the answers

What is the domain of the function resulting from the addition (𝐹𝐹 + 𝐺𝐺)(𝑥𝑥)?

<p>dom(𝐹𝐹) ∩ dom(𝐺𝐺) (C)</p> Signup and view all the answers

What is the domain of the function resulting from the subtraction (𝐹𝐹– 𝐺𝐺)(𝑥𝑥)?

<p>dom(𝐹𝐹) ∩ dom(𝐺𝐺) (A)</p> Signup and view all the answers

What is the domain of the function resulting from the composition (ℎ𝑥1 ∘ ℎ𝑥2)(𝑥)?

<p>dom(ℎ𝑥2) ∩ {𝑥|ℎ𝑥2(𝑥) ∈ dom(ℎ𝑥1)} (C)</p> Signup and view all the answers

What is the domain of the function resulting from the division (� �)(𝑥)?

<p>dom(� �) = dom(𝑓𝑓) ∩ dom(𝑔𝑔){𝑥|𝑔𝑔(𝑥) = 0} (C)</p> Signup and view all the answers

What is the domain of the function 𝑅𝑅 resulting from the square root operation?

<p>[3, +∞) (C)</p> Signup and view all the answers

What is the domain of the function 𝑃𝑃 resulting from √� �?

<p>(−∞, −1] ∪ [2, +∞) (D)</p> Signup and view all the answers

What is the domain of the function 𝐻𝐻 resulting from (�1 � �2 )(�)?

<p>[3, +∞) (D)</p> Signup and view all the answers

What is the domain of the function 𝑄𝑄 resulting from csc�√� �2 − � − 2�?

<p>(−∞, −1] ∪ [2, +∞) (B)</p> Signup and view all the answers

What is the domain of 𝐹� � resulting from �1 � �2 ?

<p>[3, +∞) (A)</p> Signup and view all the answers

What is the domain of 𝑃� � resulting from √� �2 − � − 2�?

<p>(−∞, −1] ∪ [2, +∞) (D)</p> Signup and view all the answers

What is the domain of �(�1 � �2 )(�)?

<p>[3, +∞) (A)</p> Signup and view all the answers

What is the domain of � resulting from csc�√� �2 − � − 2�?

<p>(−∞, −1] ∪ [2, +∞) (C)</p> Signup and view all the answers

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