SOLUTION: Not sure if this is in the right section Find f[g(x)] and g[f(x)] f(x)=5x^3+8 g(x)=2x Answers are f[g(x)]=40x^3+8 g[f(x)]= 10x^3+16 When I did the problem i kept getting

Algebra ->  Exponents-negative-and-fractional -> SOLUTION: Not sure if this is in the right section Find f[g(x)] and g[f(x)] f(x)=5x^3+8 g(x)=2x Answers are f[g(x)]=40x^3+8 g[f(x)]= 10x^3+16 When I did the problem i kept getting       Log On


   



Question 290398: Not sure if this is in the right section
Find f[g(x)] and g[f(x)]
f(x)=5x^3+8
g(x)=2x
Answers are
f[g(x)]=40x^3+8
g[f(x)]= 10x^3+16
When I did the problem i kept getting 10x instead of 3 and 8 instead of 16 please help with steps!!

Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
do you see any negative or fractional exponents?
No! then this is not the right category.
Doesn't functions seem more like the right category?
Are you expecting them to be equal?
Read this!
http://mathforum.org/library/drmath/view/54544.html