Question

a square minus b square minus 2 b c minus C square factors
$a2 - b2 + 2bc - c2$
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Answer 1

$a {}^{2} - b {}^{2} + 2bc - c {}^{2} rearranging \\ - b {}^{2} - c {}^{2} + 2bc + a {}^{2} \\ taking \: minus \: common \\ - (b {}^{2} + c {}^{2} - 2bc) + a {}^{2} \\ - (b - c) {}^{2} + a {}^{2}$
a^2-(b-c)^2.
it is in the form of a^2-b^2
so ur answer is
(a+b-c)(a-b+c).