If x + y = 9 and xy = 16, find the value of x2 + y2.
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Answer:
X^2+y^2=x^2+y^2+2xy-(2xy)
=(x+y)^2-2xy
By equating given value
=(9) ^2-2(16)
=81-32
=49
X^2+Y^2=49
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