Find the value of x square + y square

mathlearn · Aug 17, 2016

If x-y= 1 & x²y - xy² =2, Find the value of x²+y²

Any Ideas on how to begin?

Many Thanks :)

kaliprasad · Aug 17, 2016

mathlearn said:

If x-y= 1 & x²y - xy² =2, Find the value of x²+y²

Any Ideas on how to begin?

Many Thanks :)

you can factor 2nd equation to get xy(x-y) = 2.
now put from 1st equation value of x-y to get xy * 1 = 2 or xy =2

now $(x^2+y^2) = (x-y)^2 + 2xy = 1 ^2 + 2 * 2 = 5$

mathlearn · Aug 17, 2016

kaliprasad said:

you can factor 2nd equation to get xy(x-y) = 2.
now put from 1st equation value of x-y to get xy * 1 = 2 or xy =2

now $(x^2+y^2) = (x-y)^2 + 2xy = 1 ^2 + 2 * 2 = 5$

Many Thanks :)

Find the value of x square + y square

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