lisa989 lisa989

17-04-2022
Mathematics

contestada

If x²+ y²= 80 and xy = 12, find the value of (x - y)².

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loneguy loneguy

17-04-2022

[tex](x-y)^2\\\\=x^2+y^2 -2xy\\\\=80-2(12)\\\\=80-24\\\\=56[/tex]

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ivanthegorilla30 ivanthegorilla30

17-04-2022

We need to factorise (x−y) 2

We know the identity (a−b)2 =a2 −2ab+b2

Thus we have (x−y)2 =x2 −2xy+y2

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