因式分解2X^3-3X^2-12X+9
问题描述：
因式分解2X^3-3X^2-12X+9
答
2x^3-3x^2-12x+9
=(x-3)(2x^2+3x-3)
=(x-3)(x-(-3+31^0.5)/4)(x+(3+31^0.5)/4)