Rtet Feb 2011 Q#92
0. The factors of expression (x2 - 2xy + y2 ) - Z2
are
- Option : B
- Explanation : (x2 - 2xy + y2) - z2
= (x - y)2 - z2.
AS ( a - b)2 = a 2 + b2 - 2ab
= (x - y - z) (x - y + z).
a2 - b2 = (a + b)(a - b)
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