Given that x2 - y2 = 135 and x - y = 15 , find the value of (x+y)2

asked Apr 20, 2022 136k views

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Answer:

x² - y² = 135

<=> (x - y)(x + y) = 135

<=> 15(x + y) = 135

=> x + y = 135/15 = 9

=> (x + y)² = 81

Sean Kenny answered Apr 25, 2022

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