Find the average rate of change for this exponential function for the interval from x = 1 to x = 3

I might be able to help but a picture of the problem or the equation might work too

$12. that is my answer.

step-by-step explanation:

f(x)=2x^2 -1 

translation is a function transformation that transform the function in a way of translating. by translating the function its graph is moved  up an down. moving the function f(x) 2 units to the left will be the new function g(x) with the equation: g(x)=f(x+2)=2(x+2)^2 -1