SOLUTION: 1. If f(x)=2x-6, what is f(7)-9 2. If G(x)=x-2x^2, what is g(-3)+13

Algebra ->  Functions -> SOLUTION: 1. If f(x)=2x-6, what is f(7)-9 2. If G(x)=x-2x^2, what is g(-3)+13      Log On


   

Question 1208224: 1. If f(x)=2x-6, what is f(7)-9
2. If G(x)=x-2x^2, what is g(-3)+13
Found 2 solutions by josgarithmetic, timofer:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
(1)
Simple substitution, and evaluate!
highlight%28-1%29

(2)
Just make the substitute and evaluate!
highlight%28-8%29

Answer by timofer(105) About Me  (Show Source):
You can put this solution on YOUR website!
Lets check in on question #2.

g%28x%29=x-2x%5E2; what is g%28-3%29%2B13+%3F
(somebody needs to decide, is it G or g for the function? G and g not the same thing.)

x-2x%5E2%2B13
-3-2%28-3%29%5E2%2B13
-3-2%2A9%2B13
-2%2A9%2B10
-18%2B10
-8