Find the critical points of f(x) = x^3 - 3x^2 + 4.

Practice Questions

Q1
Find the critical points of f(x) = x^3 - 3x^2 + 4.
  1. (0, 4)
  2. (1, 2)
  3. (2, 0)
  4. (3, 1)

Questions & Step-by-Step Solutions

Find the critical points of f(x) = x^3 - 3x^2 + 4.
Correct Answer: x = 0 and x = 2
  • Step 1: Start with the function f(x) = x^3 - 3x^2 + 4.
  • Step 2: Find the derivative of the function, which is f'(x). The derivative of f(x) is f'(x) = 3x^2 - 6x.
  • Step 3: Set the derivative equal to zero to find critical points: 3x^2 - 6x = 0.
  • Step 4: Factor the equation: 3x(x - 2) = 0.
  • Step 5: Solve for x by setting each factor equal to zero: 3x = 0 gives x = 0, and x - 2 = 0 gives x = 2.
  • Step 6: The critical points are x = 0 and x = 2.
  • Step 7: To find the value of the function at a point, choose a point between the critical points, like x = 1.
  • Step 8: Evaluate f(1) = 1^3 - 3(1^2) + 4 = 1 - 3 + 4 = 2.
  • Finding Critical Points – This involves taking the derivative of a function, setting it to zero, and solving for x to find points where the function's slope is zero.
  • Evaluating Functions – This involves substituting values back into the original function to find corresponding y-values at the critical points.
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