Question

assume f(x) = -2x + 8 and g(x)=3x what is the value of (f+g)(-1)

Answer 1

f+g=

(-2x+8)+(3x)=x+8

so (f+g)(-1)=(-1)+8=7

Answer 2

I thought it was (8)(-1) so basically -8 ?

Answer 3

I mean -2x+8+3x =0
x= -8
-8(-1) = 8

Answer 4

oh now you don't set equal to 0 you just add f and g together

-2x+8+3x
x+8

which gives you the equation that you plug -1 into
(-1)+8

Answer 5

Thank youu , can you help with another question too ?

Answer 6

sure

Answer 7

assume f(x) = 2x + 8 and g(x) = 5 what is the value of (gof) (3)