x^4+3x^3-6x^2-28x-24因式分解,求助啊
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2012-03-14 · 知道合伙人教育行家
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x^4+3x^3-6x^2-28x-24
=(x^4+2x^3)+(x^3+2x^2)-(8x^2+16x)-(12x+24)
=x^3(x+2)+x^2(x+2)-8x(x+2)-12(x+2)
=(x+2)(x^3+x^2-8x-12)
=(x+2)[(x^3-3x^2)+(4x^2-12x)+(4x-12)]
=(x+2)[x^2(x-3)+4x(x-3)+4(x-3)]
=(x+2)(x-3)(x^2+4x+4)
=(x+2)(x-3)(x+2)^2
=(x-3)(x+2)^3 .
=(x^4+2x^3)+(x^3+2x^2)-(8x^2+16x)-(12x+24)
=x^3(x+2)+x^2(x+2)-8x(x+2)-12(x+2)
=(x+2)(x^3+x^2-8x-12)
=(x+2)[(x^3-3x^2)+(4x^2-12x)+(4x-12)]
=(x+2)[x^2(x-3)+4x(x-3)+4(x-3)]
=(x+2)(x-3)(x^2+4x+4)
=(x+2)(x-3)(x+2)^2
=(x-3)(x+2)^3 .
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