Question

Graph the functions on the same coordinate plane. f(x)=7 g(x)=x2+2x−8 What are the solutions to the equation f(x)=g(x)? Select each correct answer. −5 −3 3 5 7

Answer 1

You just have to set f(x) = g(x), in this case,
f(x) = 7 
g(x) = x2+2x-8
so
7 = x2+2x-8
Doing a bit of mathematcial magic, you get 
x2+2x-15=0 you can now graph this equation
In doing so, you get x = -5 and x = 3.