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.
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-> 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.
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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):
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.
