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to find the critical numbers I took the derivative which is 6x^2+6x-120 so divide by 6 to simplify


so the critical numbers will be (4,0) and (-5,0) but its wrong I don't know y?

  • Math -

    Your work looks good to me, but the critical numbers are 4 and -5, not the points you give.

    Recall the definition:

    A number a in the domain of a given function f is called a critical number of f if f '(a) = 0 or f' is undefined at x = a.

  • Math -

    Thnks :)

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