If 4x^2+9y^2=136 and xy=10, find 2x+3y
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Answer:
(2x+3y)²=(2x)²+(3y)²+2.2x.3y
=4x²+9y²+12(xy)
=136+120
=256
2x+3y=-/256
= -/16² =16.
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