Question

factorisation method x2+3x-(a2+a-2)=0

Answer 1

$x { }^{2} + 3x(a { }^{2} + a - 2) \\ = x ^{2} + 3x(a ^{2} +2 a - a - 2) \\ = x {}^{2} + 3x(a + 2)(a - 1) \\ = x(x + 3)(a + 2)(a - 1)$