Let f(x) = 7x + 5 and g(x) = x + 1. If h(x) = f(g(x)) , then what is the inverse of h(x)?
f(x) = 7x + 5
and g(x) = x + 1
⇒ h(x)=f(g(x))
=f(x+1)
=7x+7+5
=7x+12
In order to find h−1(x)
Let y=h(x)
y=7x+12
x=y−127
⇒ h−1(x)=x−127
Thus, inverse of h(x) is x−127
~Amy