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Which equation is the inverse of y = 2x2 – 8?

 Apr 10, 2020
 #1
avatar+111329 
+4

The  idea  here is to get  x  by itself  and then "swap'  x  an d y

 

So

 

y = 2x^2 - 8     add 8 to both sides

 

y + 8 = 2x^2      divide both sides by 2

 

[ y + 8 ] / 2  =  x^2        take both roots

 

±√ ( [ y + 8] / 2)    =  x        "swap" x and y

 

±√ ( [ x - 8] / 2 )   =   y

 

 

cool cool cool

 Apr 10, 2020

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