CALC

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Determine the maximum and minimum of each function on the given interval.
a)  = 2x^3 − 9x^2 ,−2 ≤ x ≤ 4
b)  = 12x − x^3 ,  x∈ [−3,5]

  • CALC -

    I will do the first one, you do the second in the same way

    a) y = 2x^3 - 9x^2 , -2 ≤ x ≤ 4

    dy/dx = 6x^2 - 18x
    = 0 for a max/min
    6x(x-3) = 0
    x = 0 or x = 3, both are within our given domain

    if x = 0 , y = 0
    if x = 3 , y = 56 - 81 = -27

    so the max is 0 and the min is -27

  • CALC -

    should have checked the end points
    if x = -2 , y = -16 - 36 = -52
    if x = 4 , y = -16

    revised answer:

    the max is 0 and the min is -52 within the given domain.

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