Question

a^2-b^2-2bc-c^2.. And the answer mentioned is (a+b-c) (a-b+c)

Answer 1

${a}^{2} - (b^{2} - 2bc + c^{2})$
$a ^{2} - (b + c)^{2}$
$(a - (b + c)) \times (a + (b + c))$
$(a - b - c) (a + b + c)$