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If 5x-2y=7 and xy=2 find the …

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If 5x-2y=7 and xy=2 find the value of (5x+2y)×(5x+2y)

Posted by Sukhmandeep Singh 7 years, 4 months ago

CBSE > Class 07 > Mathematics

1 answers

Sonali Aggarwal 7 years, 4 months ago

(5x-2y)^2 = 49
25x^2+4y^2 - 20xy = 49
= 49+40
25x^2+4y^2=89
(5x+ 2y)^2 = 25x^2+ 4y^2 + 20xy
= 89+20.2
= 129

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Posted by Shree Vanshika Reddy Reddy 3 months ago

CBSE > Class 07 > Mathematics