gven that x - y = 7 and xy = 8, find the value of (x + y)^2
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Answer:
81
Step-by-step explanation:
x-y = 7
=> (x-y)² = 7² = 49
=> x²+y²-2xy = 49
=> x²+y²+2xy = 49+4xy
=> (x+y)² = 49+32 = 81
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