If x + y = 8 , x y = 9 Find the value of x2 + y2?
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x+y =8
xy= 9
x2 + y2 = ?
x 2+ y 2 + 2xy = (8)2
x2 + y2 + 2x9 = 64
x2 + y2 + 18 =64
x2 + y2 = 64 - 18
= 46
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