H-E-L-P Determine the extrema of below on the given interval
f(x)=5x^3-61x^2+16x+3
(a) on [0,4]
The minimum is ?? and the maximum is ??
(b) on [-9,9]
The minimum is ?? and the maximum is ??
please solve so i can know which answer i got wrong.

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Do you know the derivative?

yes i did everything. x= 2/15 and x= 8

those are the critical points.

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