Question

If x+y=5 and xy=1, then the value of x square +y square is

Answer 1

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Answer 2

X+y=5 and xy=1

(X+y) ^2=x^2+y^2+2*X*y

5^2=x^+y^2+2*1

25=x^2+y^2+2

25-2=x^2+y^2

23=x^2+y^2

therefore x^2+y^2 =23.

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