2x+3y=4, xy=8, find the value of 4x+9y^2
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Step-by-step explanation:
2x+3y=8 xy=4
4x2+9y2= (2x)^2+(3y)^2
=(2x+3y)^2-2×2x×3y
= (2x+3y)^2-12 xy
=(8)^2-12×4
=64-48
=16
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