Algebramedium · Past Paper
Factorize x^2 - y^2 - z^2 - 2yz.
A(x-y-z)(x+y+z)
B(x-y+z)(x+y-z)
C(x+y-z)(x-y+z)
D(x-y-z)^2
✓ Correct Answer: A — (x-y-z)(x+y+z)
x^2 - (y^2 + 2yz + z^2) = x^2 - (y+z)^2 = (x - (y+z))(x + (y+z)).
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✓ Correct Answer: A — (x-y-z)(x+y+z)
x^2 - (y^2 + 2yz + z^2) = x^2 - (y+z)^2 = (x - (y+z))(x + (y+z)).
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