4. i need with question in the attached picture!

ANSWER

D. 13

EXPLANATION

We have

To find

means we want to find an x-value whose image is 3.

We cross multiply,

Expand:

Combine like terms,

Option D is correct.

Step-by-step explanation:

We know that f(a) =b ⇔ f^-1 (b) =a

Using this,

We are given

and

putting value of f(x)

Option D is correct.