因式分解:4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6 要有过程4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6快点啊

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因式分解:4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6 要有过程4x^3-4x^2-21x-9                                                                   9x^4+15x^3-35x^2+5x+6快点啊
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因式分解:4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6 要有过程4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6快点啊
因式分解:4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6 要有过程
4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6
快点啊

因式分解:4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6 要有过程4x^3-4x^2-21x-9 9x^4+15x^3-35x^2+5x+6快点啊
解(1)4x^3-4x^2-21x-9
=4x^3-4x^2-24x+3x-9
=4x(x^2-x-6)+3(x-3)
=4x(x+2)(x-3)+3(x-3)
=(x-3)[4x(x+2)+3]
=(x-3)(4x^2+8x+3)
=(x-3)(2x+3)(2x+1)
(2) 9x^4+15x^3-35x^2+5x+6正在解答中