if 5x - 2x=7and xy=2,find the value of (5x +2y)sq.
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5x - 2y = 7 xy = 2
sq. on both side
=(5x - 2y)² = 7²
=25x² + 4y² - 20xy = 49
=25x² + 4y² -20(2) = 49
=25x² + 4y² - 40 = 49
=25x² + 4y² = 89 --------------------1
to find,
(5x + 2y)²
= 25x² + 4y² + 20xy
= 89 + 20(2)
= 89 + 40
= 129
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