Question

factorise the following ( please answer asap )

${x}^{2} - {y}^{2} - 2y - 1$

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Answer 1

${x}^{2} - {y }^{2} - 2y - 1$

By using the identity -

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

Equation will be

$(x + y)(x - y) - 2y - 1$