Nihit wrote:

Guys do you think we can assume X^2 - Y ^2 = (X+Y)(X-Y) in (1)

It is always right to have

X^2 - Y^2 = (x+y) (x-Y) It is not something we have to assume

However, we cannot assume that

X^2 - Y^2 = (x+y) (x-Y) = 0--== Message from GMAT Club Team ==--

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