x4+4x3+3x2-2(x+3)因式分解

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x4+4x3+3x2-2(x+3)因式分解

x4+4x3+3x2-2(x+3)因式分解
x4+4x3+3x2-2(x+3)因式分解

x4+4x3+3x2-2(x+3)因式分解
x4+4x3+3x2-2(x+3)
=> x²(x²+4x+3)-2(x+3)
=> x²(x+3)(x+1)-2(x+3)
=>(x+3)(x²(x+1)-2)
=>(x+3)(x³+x²-2)

x4+4x3+3x2-2(x+3)=x²(x²+4x+3)-2(x+3)
=x²(x+3)(x+1)-2(x+3)
=(x+3)[x²(x-1)-2]

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

x=1
x4+4x3+3x2-2x-6=0
x4+4x3+3x2-2x-6
=x4-x3+5x3-5x2+8x2-8x+6x-6
=(x-1)(x3+5x2+8x+6)
x=-3
x3+5x2+8x+6=-27+45-24+6=0
x4+4x3+3x2-2x-6
=x4-x3+5x3-5x2+8x2-8x+6x-6
=(x-1)(x3+5x2+8x+6)
=(x-1)(x3+3x2+2x2+2x+6x+6)
=(x-1)(x+3)(x2+2x+6)