Question

If x + y = 8 , x y = 9 Find the value of x2 + y2?

Answer 1

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Answer 2

Answer:

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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