The range of the function f(x) = x + 5 is {7, 9}. What is the function’s domain?

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asked Apr 6, 2017 92.4k views

3 votes

The range of the function f(x) = x + 5 is {7, 9}. What is the function’s domain?

Mathematics
high-school

Martin Zikmund asked

by Martin Zikmund

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2 Answers

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Just substitute 7 for y, and solve for x. Then substitute 9 for y, and solve for x again.
7 = x + 5, x = 2

9 = x + 5, x = 4

So the range is 2 and 4.

Bibhudatta Sahoo answered Apr 8, 2017

by Bibhudatta Sahoo

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3 votes

The functions domain is (2,4).

Manjula answered Apr 11, 2017

by Manjula

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