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Question

Find 4x2y2+14x2y2, if (2xy+12xy)=1.6.

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Solution

(2xy+12xy)2=(2xy)2+1(2xy)2+212xy2xy
(1.6)2=4x2y2+14x2y2+2
2.562=4x2y2+14x2y2
So 4x2y2+14x2y2=0.56.

1209734_1461375_ans_5b990c81ce7c407b9543fe4a68147b5f.jpg

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