f(x) = (-4x2 - 2x)(-x2 - 9)
Option 1 is to use the Product Rule. Option 2 is to multiply it out:
f(x) = 4x4 + 2x3 + 36x2 + 18x
f '(x) = 16x3 + 6x2 + 72x + 18
To find f '(-5) just plug in x = -5.
Sasha H.
asked • 11/20/18Find f '(−5), if f(x) = (−4x^2 − 2x)(−x^2 − 9).
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