Question 784398
2x^4 + 7x^2 - 15x^3 = 0
2x^4 - 15x^3 + 7x^2 = 0
x^2 (2x^2 - 15x + 7)
x^2 (2x - 1)(x -7)

check:
x^2 (2x^2 - 14x - x + 7)
x^2 (2x^2 - 15x + 7)
2x^4 - 15x^3 + 7x^2