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20-03-2021
Mathematics

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

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20-03-2021

Answer:

x² - y² = 135

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

<=> 15(x + y) = 135

=> x + y = 135/15 = 9

=> (x + y)² = 81

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