basically, x becomes y an y becomes x
inverses
if f(x)=y, then f⁻¹(y)=x
so what you do is evaluate f(4) and that answer is the x in the f⁻¹(x)
f(4)=2(4)+2
f(4)=8+2
f(4)=10
theefor
f⁻¹(10)=4
if you wanted to find inverse
y=2x+2
x=2y+2
x-2=2y
\(\frac{x-2}{2}\)=y
f⁻¹(x)=\(\frac{x-2}{2}\)
anyway, f⁻¹(10)=4
