Algebrahard · Past Paper
Factorize: x^2 - 4xy + 4y^2 - z^2 - 6z - 9
A(x-2y+z+3)(x-2y-z-3)
B(x-2y+z-3)(x-2y-z+3)
C(x+2y+z+3)(x-2y-z-3)
D(x-2y)^2 - (z+3)^2
✓ Correct Answer: A — (x-2y+z+3)(x-2y-z-3)
(x-2y)^2 - (z+3)^2 = (x-2y + z+3)(x-2y - (z+3)).
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