Question

PLEASE HELP!!
MEDAL!!
Consider the function f(x)=3x^2+3.
What is the average rate of change of f(x) over the interval [5,9]?

a. 168
b. 52
c. 42
d. 21

Answer 1

it might be c but I'm not sure :/

Answer 2

ohh okay, i wanna know how you got the answer..please

Answer 3

\(average~rate~of~change ~from~a~to~b= \dfrac{f(b)-f(a)}{b-a}\)

Answer 4

So here you have \(\dfrac{f(9)-f(5)}{9-5}\)

Answer 5

how do i solve this?? @geerky42

Answer 6

\[f(\color{red}x)=3\color{red}x^2+3\]So \(f(\color{red}9)=3(\color{red}9)^2+3\) and \(f(\color{red}5)=3(\color{red}5)^2+3\)