Sir,

Asked by supriyaa.yn | 22nd Jan, 2009, 10:27: AM

Expert Answer:

4. ab(x2+y2)-xy(a2+b2)

=abx2 + aby2 -xya2 - xyb2

=abx2 -xya2 + aby2  - xyb2 

=ax(bx-ay) +by ( ay-bx)

=(bx-ay)(ax-by)

Answered by  | 22nd Jan, 2009, 10:39: AM

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