#### To determine

**a ) To find:** f−1(3)

#### Explanation

Suppose the function f is one-to-one

Given f(7)=3 and f′(7)=8

Since f(7)=3,f−1(3)=7

**Final statement:** f−1(3)=7

#### To determine

**b) To find:** The value of (f−1)′(3)

#### Explanation

f(7)=3⇒f−1(3)=7

We Know that (f−1)′(3)=1f′(f−1(3))

(f−1)′(3)=1f′(f−1(3))=1f′(7)=18

**Final statement:** (f−1)′(3)=18