Increasing & Decreasing Function
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Questions and Answers

What is the condition for a function f(x) to be decreasing?

  • f'(x) = 0
  • f'(x) ≠ 0
  • f'(x) < 0 (correct)
  • f'(x) > 0

If f(x) = x^2 - 2x, then f(x) is increasing for which value of x?

  • x > 2
  • x < 1
  • x > 1 (correct)
  • x < 2

A function f(x) is said to be monotonic on an interval (a, b) if it is either:

  • constant on (a, b)
  • decreasing on (a, b) and increasing on (b, a)
  • increasing or decreasing on (a, b) (correct)
  • increasing on (a, b) and decreasing on (b, a)

If f'(x) = 2(x - 1), then f(x) is decreasing for which value of x?

<p>x &lt; 1 (A)</p> Signup and view all the answers

What is the condition for a function f(x) to be increasing?

<p>f'(x) &gt; 0 (A)</p> Signup and view all the answers

Let f(x) = 2x^3 - 5x^2 + 3x + 1. Which of the following intervals is the function strictly increasing?

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

Consider the function f(x) = x^2 - 4x + 3. Which of the following statements is true about the function?

<p>The function is strictly increasing on (1, 2). (D)</p> Signup and view all the answers

Let f(x) = 3x^4 - 4x^3 + 2x^2 + 1. Which of the following intervals is the function strictly decreasing?

<p>(0, 1) (A)</p> Signup and view all the answers

Consider the function f(x) = e^x(1 - x). Which of the following intervals is the function strictly increasing?

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

Let f(x) = x^3 - 6x^2 + 9x + 2. Which of the following statements is true about the function?

<p>The function is strictly increasing on (1, 3). (C)</p> Signup and view all the answers

What is the necessary condition for a function f(x) to be increasing on an interval (a, b)?

<p>f'(x) &gt; 0 for all x ∈ (a, b) (B)</p> Signup and view all the answers

If f'(x) < 0 for all x ∈ (a, b), what can be concluded about the function f(x) on the interval (a, b)?

<p>f(x) is decreasing on (a, b) (A)</p> Signup and view all the answers

What is the sufficient condition for a function f(x) to be increasing on an open interval (a, b)?

<p>f'(x) &gt; 0 for all x ∈ (a, b) (C)</p> Signup and view all the answers

Let f(x) be a differentiable function on an open interval (a, b). If f'(x) > 0 for all x ∈ (a, b), what can be concluded about the function f(x)?

<p>f(x) is increasing on (a, b) (D)</p> Signup and view all the answers

What is the graphical analysis interpretation of f'(x) > 0 for all x ∈ (a, b)?

<p>The tangent to the graph of f(x) makes an acute angle with the x-axis on (a, b) (C)</p> Signup and view all the answers

A function f(x) is increasing on an interval (a, b) if its derivative f'(x) is:

<p>positive for all x ∈ (a, b) (C)</p> Signup and view all the answers

What is the condition for a function f(x) to be monotonic on an interval (a, b)?

<p>It is either increasing or decreasing on (a, b) (D)</p> Signup and view all the answers

If a function f(x) is differentiable on an open interval (a, b) and its derivative f'(x) = 0 for all x ∈ (a, b), then what can be concluded about the function f(x)?

<p>It is constant on (a, b) (D)</p> Signup and view all the answers

Let f(x) = x^3 - 3x^2 + 2x. Find the intervals on which the function is increasing?

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

If a function f(x) is increasing on an interval (a, b) and its derivative f'(x) is continuous on (a, b), then what can be concluded about the function f(x)?

<p>It is strictly increasing on (a, b) (A)</p> Signup and view all the answers

If f'(x) ≥ 0 for all x ∈ (a, b), what can be concluded about the function f(x) on the interval (a, b)?

<p>f(x) is monotonically increasing (A)</p> Signup and view all the answers

Let f(x) be a differentiable function on an open interval (a, b). If f'(c) > 0 for some c ∈ (a, b), what can be concluded about the function f(x)?

<p>f(x) is monotonically increasing on some subinterval of (a, b) (D)</p> Signup and view all the answers

Let f(x) be a strictly increasing function on an interval [a, b]. What can be concluded about the inverse function f^-1?

<p>f^-1 is continuous on the interval [f(a), f(b)] (C)</p> Signup and view all the answers

Consider the function f(x) = x^2 - 4x + 3. What can be concluded about the function f(x) on the interval [0, 2]?

<p>f(x) is strictly increasing on the entire interval [0, 2] (B)</p> Signup and view all the answers

Let f(x) be a continuous function on an interval [a, b]. What is the necessary condition for f(x) to be monotonically increasing on the interval [a, b]?

<p>f'(x) ≥ 0 for all x ∈ (a, b) (B)</p> Signup and view all the answers

What is the condition for a function f(x) to be monotonically increasing in a defined interval?

<p>f'(x) &gt; 0 (C)</p> Signup and view all the answers

If f(x) = x^2 - 4x + 3, what can be concluded about the function?

<p>It is monotonically increasing in (0, ∞) and decreasing in (-∞, 0) (A)</p> Signup and view all the answers

What is the condition for a function f(x) to be monotonically decreasing in a defined interval?

<p>f'(x) &lt; 0 (A)</p> Signup and view all the answers

If f(x) is a differentiable function on an open interval (a, b), what can be concluded about the function if f'(x) > 0 for all x ∈ (a, b)?

<p>The function is monotonically increasing (D)</p> Signup and view all the answers

What is the graphical analysis interpretation of f'(x) > 0 for all x ∈ (a, b)?

<p>The tangent line is increasing (D)</p> Signup and view all the answers

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