Question

F(x) = 4x - 8

what is the value of f^-1(-2)?

Answer 1

`If\ f(x)=y,\ then\ f^(-1)(y)=x.\\\\f(x)=4x-8\to4x-8=-2\qquad\text{add 8 to both sides}\\\\4x=6\qquad\text{divide both sides by 4}\\\\x=(6)/(4)\\\\x=(3)/(2)\\\\Answer:\ \boxed{f^(-1)(-2)=(3)/(2)}`