how do you solve polynomial equation by factoring 3x^4 + 11x^3 = 4x^2

3x^4 + 11x^3 = 4x^2

3x^4 + 11x^3 - 4x^2 = 0
x^2(3x^2+11x-4) = 0
x^2(3x-1)(x+4) = 0
...