Identrify the critical points and find the maximum and minimum value on the given interval I.f(x) = x2 + 18x + 81; I = [-18, 0]
A. Critical points: -18, -9, 0; maximum value 81; minimum value 0
B. Critical points: -9; maximum value 18; minimum value 0
C. Critical points: -18, 0, 81; minimum value 0
D. Critical points: -18, 0, 9; maximum value 81; minimum value 0
Answer: A
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