Factorise by Factor theorem x³ + 13x² +31x-45
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x^3+14x^2-x^2+45x-14x-45
x^3+14x^2+ 45x-x^2-14x-45
x(x^2+14x+45)-1(x^2+14x+45)
(x-1)(x^2+14x+45)
(x-1)(x^2+9x+5x+45)
(x-1)(x+9)(x+5)
x^3+14x^2+ 45x-x^2-14x-45
x(x^2+14x+45)-1(x^2+14x+45)
(x-1)(x^2+14x+45)
(x-1)(x^2+9x+5x+45)
(x-1)(x+9)(x+5)
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