Question

Factorise a^2-b^2-2b-1

Answer 1

Here's ur answer,
Maybe it will help...
${a}^{2} - {b}^{2} - 2b - 1 \\ = {a}^{2} - ( {b}^{2} + 2b + 1) \\ = {a}^{2} - {(b + 1)}^{2} \\ = (a - b - 1)(a + b + 1)$


Hope it helped!!!

Answer 2

Answer:

(a+b+1)(a-b-1)

Step-by-step explanation:

$a^2 - b^2 - 2b - 1\\\\= a^2 - (b^2 + 2b + 1)\\\\= a^2 - (b^2 + 1^2 + 2(b)(1))\\\\= a^2 - (b+1)^2\\\\= (a + (b+1))(a - (b+1))\\\\= \large \underline{\boxed{\boxed{\bold(a+b+1)(a-b-1)}}}}$

Hope it helps.