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Which equation can be simplified to find the inverse of y = x2 – 7?

 Apr 10, 2020
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y  =  x2 + 7

 

To find an inverse:

 

First:  interchange x and y   --->   x = y2 + 7

 

Second:  solve for y:   --->   y2 + 7  =  x

                                                   y2  =  x - 7

                                                   y  =  +/- sqrt(x - 7)

 

Because of the +/- sign, there is no unique inverse.

 Apr 10, 2020

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