Question

Find the factors of a^2 - b^2 - 2bc - c^2

Answer 1

$your \: answer$
$a ^{2} - b ^{2} - 2bc - c ^{2}$
now

a2-1(b2+2bc+c2)

we have took (-) common

now (b2+2bc+c2) is forming identity (b+c)2

a2-(b+c)2

this is forming a2-b2=(a+b)(a-b)

so

(a+b+c) (a-b-c)

hope helps