Question

x+y=6x-y=4 find x^2+y^2and xy

Answer 1

Given that

x2−y2=30x2−y2=30

(x+y)(x−y)=30(x+y)(x−y)=30

x−y=30x+yx−y=30x+y

substituting x+y=6x+y=6 in above expression,

x−y=306x−y=306

x=5


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