If the function is given by g(x)=23x+7, then the domain value that corresponds to a range value of 3 is
A
−6
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B
−2
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C
6
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D
9
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Solution
The correct option is A−6 Given, g(x)=23x+7,g(x)=3 ⇒3=23x+7 ⇒9−21=2x ⇒−12=2x ⇒x=−6 You could also graph the function and find the value of x (the domain
value) for which the value of y (the range value) is 3. The point on the
graph is (−6,3). Therefore the domain value is −6.