Question

For f(x)=4x+1 and g(x)=x^2-5, find (f-g)(x)

a. -x^2 + 4x - 4
b. 4x^2 - 19
c. 6 + 4x - x^2
d. x^2 - 4x - 6

I think it's c. please explain!

Answer 1

oh, you are right, hehehe.. me wrong. It's C

Answer 2

I was originally getting -x^2 + 4x + 6 when I combined like terms but if you look at c. it is just that but backwards!

Answer 3

So that is why I said you are correct

Answer 4

(f-g) (x) = f(x) - g(x) = 4x+1 - x^2 + 5 = -x^2 + 4x +6

Answer 5

Thanks for your help both of you just wanted to confirm!