1.

Factorising \[{{(x-y)}^{2}}+4xy-{{z}^{2}}\], we get

A.  \[(x+y+z)(x+y-z)\]
B.  \[(y-y-z)(x+y-z)\]
C.  \[(x-y+z)(x+y-z)\]
D.  None of these
Answer» B.  \[(y-y-z)(x+y-z)\]


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