Question

a^2-b^2-2b-1 factorise
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Answer 1

This is your answer
:)

Answer 2

Answer:

$a { }^{2} - b {}^{2} -2b - 1 \\ = a {}^{2} - (b {}^{2} + 2b +1) \\ = a - (b +1) {}^{2} \\ = (a + b + 1)(a - b - 1)$