Find the inverse function f−1(a)f^{-1}(a)f−1(a) if f(a)=a−9f(a) = a - 9f(a)=a−9.
f−1(a)=a+9f^{-1}(a) = a + 9f−1(a)=a+9
f−1(a)=9−af^{-1}(a) = 9 - af−1(a)=9−a
f−1(a)=a9f^{-1}(a) = \frac{a}{9}f−1(a)=9a
f−1(a)=a−9f^{-1}(a) = a - 9f−1(a)=a−9