Question

Using complete sentences, explain how to find the average rate of change for f(x) from x = 4 to x = 7.
My equation is y = 2(x-3)^2+6 in vertex form and y = 2x^2-12x-12 in standard form. Can anyone help me out.

Answer 1

First of all find the y-values of 4 and 7.
This is will you two points (4,?) and (7,?)
Then we can apply the slope formula m = (y2-y1)/(x2-x1)
This will give us the average rate of change for f(x) from x = 4 to x = 7

Answer 2

But how am I suppose to find the y value in both of the points?

Answer 3

plug in x = 4 or x = 7 into y=2x^2 - 12x -12
That will you give your y-value

Answer 4

Oh, Okay thank you very much!!!

Answer 5

np :]