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kolbaska11 [484]
2 years ago
9

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

Mathematics
1 answer:
kirill [66]2 years ago
6 0

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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