SOLUTION: Please help me with this. f(x)=x^2-2, then f(x+2)-f(x)=??

Algebra ->  Exponents-negative-and-fractional -> SOLUTION: Please help me with this. f(x)=x^2-2, then f(x+2)-f(x)=??      Log On


   

Question 95091: Please help me with this.


f(x)=x^2-2, then f(x+2)-f(x)=??
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
if f(x)=x^2-2,
then
f(x+2)=(x+2)^2-2
.
putting it all together
f(x+2)-f(x)= (x-2)^2-2-(x^2-2) [multiply]
%28x%5E2%2B4x%2B4-2%29-%28x%5E2-2%29%29
%28x%5E2%2B4x%2B4-2-x%5E2-2%29 [combine like-terms]
4x+4