Que. 11. If x - y = 7 and xy = 2 than find the value of r? + y2
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Answer:
x-y=7
It is given xy=2
Squaring on both sides
(x-y)²=(7)²
x²+y²-2xy=49
x²+y²-4=49 since(xy=2)
x²+y²=49+4
x²+y²=53
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