Posted by Carla on .
1. f(x)=x^3+5
does f(x) have an inverse? if so, find the inverse and decide if it is a function.
2. if f(x)= 3x+1 and g(x)= x^21, find
(f∙ g)(2)
3. if f(x)= (2x)^2, find f(4)
thank you :)

algebra/trig 
Reiny,
1. let y = x^3 + 5
inverse is x = y^3 + 5
y^3 = x5
y = (x5)^(1/3)
yes , it is a function
2. (f∙ g)(2) = f(g(2))
= f(3)
= 10
3. Come on, you can do this!