if x^2 + 9y^2 =9 and xy= 1 find (2x+6y)^2
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Step-by-step explanation:
x²+9y²+6xy-6xy=9
(x+3y)²-6=9
(x+3y)²=15
2²(x+3y)²=60
(2x+6y)²=60
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