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With polynomial division is the same as with numbers division: 6 : 3 = 2 because 2 * 3 = 6. (x^3 - 8x^2 + 15x - 8) : (x - 1) = x^2 - 7x + 8 because (x^2 - 7x + 8)(x - 1) = x^3 - x^2 - 7x^2 + 7x + 8x - 8 = x^3 - 8x^2 + 15x - 8. Division step by step.