exam Maths Puzzle Numerical Ability

A polynomial x has degree 3. The coefficient of x squared is 3 less than the coefficient of x cubed. The coefficient of x is three times the coefficient of x squared. The remain

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How do I answer this problem.
y^4+3y^3-5y^2-15y

I tried to solve it this way but I think that it is wrong.

y^4 + 3y^3 -5y^2-15y
y^3(y+3) -5y(y+3)

=(y+3)(y^3-5y) factor completely.
512x^3-1