For the function

MATHEMATICS · Single correct · A Level · Mathematics · Differentiation · Differentiation

Problem

For the function f(x)=−x3+3x2+9x+1f(x)=-x^3+3x^2+9x+1, at which xx-value does ff attain a local maximum? (a) x=1x=1 (b) x=3x=3 (c) x=−1x=-1 (d) x=2x=2

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