The range of the function f(x)=x+5 is (7,9). what is the function's domain?
is it
(2,4)
(-2,-4)
(12,14)
(-12,-14)
(0,5)

Answers

7=x+5
2=x

9=x+5
4=x
range is (2,4)
The function is : f ( x ) = x + 5 
If the range is ( 7, 9 ) we have to find the domain.
7 = x 1 + 5
x 1 = 7 - 5 = 2
9 = x 2 + 5 
x 2 = 9 - 8 = 4

The domain is : A )  ( 2, 4 ) 


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