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How do you find it? Solve

 Feb 25, 2019
 #1
avatar+104627 
+2

y = 2 + √ [ y^2 - 12 ]         subtract 2 from both sides

 

y - 2 =  √ [y^2 - 12 ]         square both sides

 

( y - 2)^2 = y^2 - 12

 

y^2 - 4y + 4  = y^2 - 12       subtract y^2 from both sides

 

-4y + 4 = -12        subtract 4 from both sides

 

-4y = -16       divide both sides by -4

 

y = 4

 

Check that this solution works in the original equation, GM....

 

 

cool cool cool

 Feb 25, 2019

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