分解因式:9x^4-3x^3+7x^2-3x-2
问题描述：
分解因式:9x^4-3x^3+7x^2-3x-2
答
3x^4-2x^3-9x^2+12x-4=03x^4-3x^3+x^3-x^2-8x^2+8x+4x-4=03x^3(x-1)+x^2(x-1)-8x(x-1)+4(x-1)=0(3x^3+x^2-8x+4)(x-1)=0(3x^3-3x^2+4x^2-4x-4x+4)(x-1)=0[3x^2(x-1)+4x(x-1)-4(x-1)](x-1)=0(x-1)^2(3x^2+4x-4)=0(x-1)^2(3x-2)(x+2)=0 减肥瘦身上“好店123”呀!