if 5x-2y=7 and xy=2,then find the value of (5x+2y)2
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Given 5x - 2y = 7 and xy =2 We know, (a + b)2 = a2 + b2 + 2ab or (a + b)2 = a2 + b2 - 2ab + 4ab = (a - b)2 + 4 ab So,
(5x+2y)2 = ( 5x - 2y)2 + 4× 5x × 2y) = 49 + 40 xy
so, (5x+2y)2 = 49 + 40 x 2 = 129.
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(5x+2y)2 = ( 5x - 2y)2 + 4× 5x × 2y) = 49 + 40 xy
so, (5x+2y)2 = 49 + 40 x 2 = 129.
PLZ mark me as a BRAINLIST
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