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Let y = 3x^3 - 3x^2 - 3x. On the interval [0, 2], find the max and min.

a. Max at x = 1, Min at x = 0
b. Max at x = 0, Min at x = 2
c. Max at x = 2, Min at x = 1
d. Max at x = 2, Min at x = 0

1 Answer

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Final answer:

The maximum value of the function y = 3x^3 - 3x^2 - 3x occurs at x = 2 and the minimum value occurs at x = 1 on the interval [0, 2].

Step-by-step explanation:

To find the maximum and minimum values of the function y = 3x^3 - 3x^2 - 3x on the interval [0, 2], we first need to take the derivative of the function to find the critical points. The derivative of the function is:

y' = 9x^2 - 6x - 3.

Setting the derivative equal to zero to find the critical points gives us:

9x^2 - 6x - 3 = 0.

Solving this quadratic equation, we find the critical points are:

x = 1 and x = -1/3.

However, since x = -1/3 is not within the interval [0, 2], we only consider x = 1. By evaluating the original function at the endpoints of the interval (x=0 and x=2) and the critical point (x=1), we can determine the maximum and minimum values within the interval. The function values are:

  • y(0) = 3(0)^3 - 3(0)^2 - 3(0) = 0,
  • y(1) = 3(1)^3 - 3(1)^2 - 3(1) = -3,
  • y(2) = 3(2)^3 - 3(2)^2 - 3(2) = 12.

From these values, we can see that the maximum value occurs at x = 2 and the minimum value occurs at x = 1. Therefore, the correct answer is 'c. Max at x = 2, Min at x = 1'.

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