If 4x²+9y²=40 and xy=2 then 2x+3y=?
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Step-by-step explanation:
(2x) 2 +(3y) 2 =40
(2x)(3y)=12
(2x+3y) 2=(2x) 2+(3y) 2 +2(2x)(3y)
=40+24
=64
2x+3y=±8
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