Question

if x +y = root 11 , x^2+y^2 =5 find the value of xy

Answer 1

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Answer 2

x+y=root 11

×^2+y^2=5

(x+y)^2=x^2+y^2+2×x×y

(root 11)^2=5+2xy

11-5=2xy

6/2=xy

3=xy

Therefore, xy=3