Seth A.

asked • 13d

If f(x) = 3x-8, what is f^-1(-4)

I was given the following Piecewise function:

f(x) = 3x-18, x<0

f(x) = x2-8, 0≤x<3

f(x) = (x-2)3, x≥3

And I was asked:

What is f -1(-4)

It was multiple choice. The given answers were:

A: -20

B: 3/4

C: 2

D: Two minus the cubed root of 4

E: The answer cannot be determined from the information given.

I put E. What would you have said?

Seth A.

Apologies, it is 3x-8, not 3x-18. I agree that the answer would be 4/3, but that was not an answer


2 Answers By Expert Tutors


Seth A.

How would we have known to plug it into the second equation? How would we have known to try 2?


Mark M.

Since the problem is multiple choice, I tried each answer choice (starting with the easiest one). If the problem was not multiple choice then the problem would be more challenging.


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