Question

factorise m² -n² - 2n-1​

Answer 1

Answer:

${m}^{2} - {n}^{2} - 2n - 1 \\ = {m}^{2} - \{{n}^{2} + 2n + 1 \} \\ = {m}^{2} - (n + 1)^{2} \\ = (m + n + 1)(m - n - 1)$