Question

factorise x2 -1 -2a -a2

Answer 1

${x}^{2} - {a}^{2} - 2a - 1 = 0$
${x}^{2} - ( {a}^{2} + 2a + 1) = 0$
${x}^{2} - {(a + 1)}^{2}$
$(x - (a + 1)) \: \: \: \: (x + (a + 1))$
$(x - a - 1)(x + a + 1)$