-15x^4-2^3+8x^2 Factor out this trinomial?

Question

How do you go about the power to the 4

Answer 1

-15x^4 -2x^3 + 8x^2

-x^2(15x^2 + 2x - 8) {common factor}

In the trinomial, ac = 15(-8) = -120

Factors of -120 that add to +2 are +12 & - 10

-x^2(15x^2 + 12x - 10x - 8) {rewrite for grouping}

-x^2[3x(5x + 4) - 2(5x + 4)]

-x^2(3x - 2)(5x + 4)

Answer 2

first factor out x^2

x^2(-15x^2 - 2x + 8)

thats the final answer. the rest can't be factored