Algebrahard · Past Paper
Factorize a^2 - b^2 - c^2 - 2bc.
A(a-b-c)(a+b+c)
B(a-b+c)(a+b-c)
C(a+b-c)(a-b+c)
D(a-b-c)^2
✓ Correct Answer: A — (a-b-c)(a+b+c)
a^2 - (b^2 + 2bc + c^2) = a^2 - (b+c)^2 = (a-(b+c))(a+(b+c)).
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