Question

Find the derivative of f(x) = -12x^2 + 9x at x = 6.

Answer 1

do you know how to apply the power rule for derivatives?
\[\frac{ dy }{ dx } x ^{n}= nx ^{n-1}\]
apply it to each term in your given equation f(x) = -12x^2 + 9x

then substitute x=6 to the derived equation