Question

f(x)=x+3 g(x)=x-3 find fog(-3)

Answer 1

f(x)=x+3
g(x)=x-3

f(g(x)) = put x in f(x) = g(x)
f(g(x)) = (x-3) +3
f(g(x)) = x
fog(-3) = ?

Answer 2

I keep coming up with -3, but the answer is supposed to be 9

Answer 3

g(x)=-3-3=-6
f(x)= -6+3=-3

Answer 4

it should be -3. I dont know any other way
http://www.purplemath.com/modules/fcncomp2.htm

Answer 5

Ok thanks! I thought I was going crazy.

Answer 6

anytime :)