(x^3-x^2-17x-15) divided (x-5)
Peerforming some polynomial long division, we have
x^2 + 4x + 3
x - 5 [ x^3 - x^2 - 17x - 15 ]
x^3 - 5x^2
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4x^2 - 17x
4x^2 - 20x
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3x - 15
3x - 15
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Note that the resultant polynomial, x^2 + 4x + 3, will factor as (x + 3) (x + 1)