Answer:

3x + 1

Step-by-step explanation:

divide the first term of the cubic equation to the first term of quadratic equation, same as the last term of both equation

ex.: 3x³ ÷ x² = +3x

2 ÷ 2 = +1

then combine the results:

3x + 1

Check:

(3x + 1)(x² - 6x² + 2)

3x³ - 18x² + 6x + x² - 6x + 2

combine like terms

3x³ - 17x² + 2

with that, the answer is absolutely 3x + 1.