how do i start?

Question

For the following of functions, find (a) (f+g)(x) and (b)  (f-g)(x) 

 

f(x)=4x squared+7x-4 

 

g(x)=-5x squared+4x-9

Answer 1

Madison, it's exactly what it's asking for.

 

(f + g)(x) = 4x² + 7x - 4 + (-5x² + 4x - 9) = 4x² + 7x - 4 - 5x² + 4x - 9 =  -x² + 11x - 13

 

I bet you can do the other one! Don't forget to distribute the -.