25-10-2016
Mathematics

contestada

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

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linktra linktra

25-10-2016

The functions domain is (2,4).

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CaptainBeyond CaptainBeyond

25-10-2016

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.

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