(x^2+y^2),if xy=-15,x-y=6
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x^2+y^2=+2xy+(x-y)^2...(since we know
(x-y)^2
=x^2+2xy+y^2
x^2+y^2=+2xy+(x+y)^2)
=2(15)+(6)*2
=30+36
=66
(x-y)^2
=x^2+2xy+y^2
x^2+y^2=+2xy+(x+y)^2)
=2(15)+(6)*2
=30+36
=66
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