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  • 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 linktra
  • 25-10-2016
The functions domain is (2,4).
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CaptainBeyond
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.
Answer Link

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