Question

factorise :- Ab ( X square + y square ) -xy (a square + bsquare )

Answer 1

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$ab(x^2+y^2)-xy(a^2+b^2)\\\\abx^2+aby^2-a^2xy-b^2xy\\\\abx^2-b^2xy-a^2xy+aby^2\\\\bx(ax-by)-ay(ax-by)\\\\(ax-by)(bx-ay)$