x四次方+2x立方-3x平方-4x-12因式分解~

问题描述:

x四次方+2x立方-3x平方-4x-12因式分解~

原式=x²(x²+2x-3)-4(x+3)
=x²(x+3)(x-1)-4(x+3)
=(x+3)(x³-x²-4)

(x+3)[x*x(x-1)-4]

原式=(x^4+2x^3-3x^2)-4(x+3)
=x^2(x^2+2x-3)-4(x+3)
=x^2(x+3)(x-1)-4(x+3)
=(x+3)[x^2(x-1)-4)
=(x+3)(x^3-x^2-4)

原式=(x^4+2x³-3x²)-4(x+3)
=x²(x²+2x-3)-4(x+3)
=x²(x+3)(x-1)-4(x+3)
=(x+3)(x³-x²-4)
对于x³-x²-4=(x³-2x²)+(x²-4)=x²(x-2)+(x-2)(x+2)=(x-2)(x²+x+2)
则原式=(x+3)(x-2)(x²+x+2)