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

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

anonymous · Answer

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

clamin · Answer

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

geerky42 · Answer

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

geerky42 · Answer

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

clamin · Answer

how do i solve this?? @geerky42

geerky42 · Answer

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