Question

Factorise x3 - 3x2 - 9x - 5​

Answer 1

${x}^{3} - 3 {x}^{2} - 9x - 5 \\ {x}^{3} + {x}^{2} - 4 {x}^{2} - 4x - 5x - 5 \\ {x}^{2} (x + 1) - 4x(x + 1) - 5(x + 1) \\ ( {x}^{2} - 4x - 5)(x + 1) \\ ( {x}^{2} + x - 5x - 5)(x + 1) \\ (x(x + 1) - 5(x + 1))(x + 1) \\ (x + 1)(x + 1)(x - 5)$