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
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13d

## 2 Answers By Expert Tutors

By:

Seth A.

How would we have known to plug it into the second equation? How would we have known to try 2?
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13d

Mark M.

tutor
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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13d Mark M. answered • 13d

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Mathematics Teacher - NCLB Highly Qualified

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