anonymous 3 years ago the average rate or change of f(x)=5x^2 - 2, from 2 to 4

1. myininaya

$\frac{f(4)-f(2)}{4-2}$

2. anonymous

what do the fs stand for? i get the bottom will be 2

3. myininaya

Well you have $f(x)=5x^2-2$

4. myininaya

$f(4)=5(4)^2-2 \text{ and } f(2)=? \text{ I will let you say what } f(2) \text { is }$

5. anonymous

5(2)^2

6. anonymous

-2

7. anonymous

60/2 ??????????

8. anonymous

9. anonymous

or just 30. am i right

10. myininaya

Yes 60/2 does equal 30