For the function f(x) = x^4 - 8x^2 + 16, find the coordinates of the inflection

Practice Questions

Q1
For the function f(x) = x^4 - 8x^2 + 16, find the coordinates of the inflection point.
  1. (0, 16)
  2. (2, 0)
  3. (4, 0)
  4. (2, 4)

Questions & Step-by-Step Solutions

For the function f(x) = x^4 - 8x^2 + 16, find the coordinates of the inflection point.
Correct Answer: (2, 0)
  • Step 1: Start with the function f(x) = x^4 - 8x^2 + 16.
  • Step 2: Find the first derivative f'(x) to understand the slope of the function.
  • Step 3: Find the second derivative f''(x) to determine the concavity of the function.
  • Step 4: Set the second derivative f''(x) equal to 0 to find potential inflection points.
  • Step 5: Solve the equation 12x^2 - 16 = 0 to find the values of x.
  • Step 6: Simplify the equation to get x^2 = 4, which gives x = ±2.
  • Step 7: Calculate the function value f(2) to find the y-coordinate of the inflection point.
  • Step 8: Substitute x = 2 into the original function: f(2) = 2^4 - 8(2^2) + 16 = 0.
  • Step 9: The coordinates of the inflection point are (2, 0).
  • Second Derivative Test – The second derivative is used to determine the concavity of a function and to find inflection points where the concavity changes.
  • Finding Inflection Points – Inflection points occur where the second derivative is zero or undefined, indicating a change in concavity.
  • Evaluating Functions – To find the coordinates of the inflection point, the original function must be evaluated at the x-values found from the second derivative.
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