Question

Find f′(x) at the given value of x. f(x)=−4x^2+11x; Find f′(9) −243 27 −61 −17

Answer 1

f(9) = -225

Explanation:

f(x) = −4x^2 + 11x f(9)

f(9) = -4(9)² + 11(9)

f(9) = -4(81) + 99

f(9) = - 324 + 99

f(9) = -225