Question

the functionary f is such that f(x)=7x-6 a)work out the value of f(4) b)hence, or otherwise,work out the value of f^-1(22)

Answer 1

Explanation:

a) f(4)=7(4)-6=22.

b) This is equal to 4. Since
`f^(-1)(x)=y \implies f(y)=x`, we get that since f(4)=22,
`f^(-1)(22)=4`.