Question

х^3 + 5x^2 - 9x - 45 =0

Answer 1

${x}^{3} + 5 {x}^{2} - 9x - 45 =0 \\ {x}^{2} (x + 5) - 9(x + 5) = 0 \\ (x + 5)( x - 3)(x + 3) = 0 \\ x = - 5 \\ x = - + 3$