A (x+y+z)(x-3)
B (x-z)(x+2y+z)
C (x+z)(x-2y+z)
D (x-3)(x-2y-z)
Correct Answer: Option B
x2 +2xy-2yz-z2
=x2 -z2 +2xy-2zy
=(x+z)(x-z)+2y(x-z)
=(x-z)(x+2y+z)
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