This is easier than it looks because once you eliminate the monomial common to each term, it becomes a simple quadratic.
30x4 - 38x3 - 12x2
first, notice that 2x2 is common to all three terms
(2)(x)(x) (15x2 - 19x + 6)
the quadratic can be factored
(2)(x)(x)(5x - 3)(3x - 2)