Does anyone know how to do this? I’m lost

B

Step-by-step explanation:

To find the inverse function, you switch x with y and y with x. Then, you solve for y.

                                 [switch x with y, and y with x]                        

                                 [add both sides by 4]

                                 [square root both sides]

                                   [add both sides by 1]

Now that we know the inverse function, we can actually tell that the answer is B. We know this because of the restriction that f(x) is x≤1. This makes it positive, and B the answer.

45

step-by-step explanation: