SOLUTION: If 2x+3y=12 and xy =6, find the value of 4x square +9y square . P.S I am not able to put square up so I have written in words.Thanks.

Question 1119335: If 2x+3y=12 and xy =6, find the value of 4x square +9y square .
P.S I am not able to put square up so I have written in words.Thanks.
Answer by ikleyn(52781) (Show Source): You can put this solution on YOUR website!
.

From 

2x + 3y = 12  you have (by squaring both sides)


 = 144.


Now replace  xy in the last formula by 6 (as it is given !) to get


 = 144,


 = 144 - 2*2*3*6 = 72.


It is your 


Answer.   = 72.

Solved.

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To write x_squared, write x^2. Find the symbol " ^ " in your keyboard, where the button (digit) "6" is, in the upper register.

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