因式分解,求大神帮助
1个回答
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(1) (6x+7)^2*(3x+4)(x+1)-6
设x+1=y
那么原式=(6y+1)^2*(3y+1)*y-6
∵y=1/3时上式=0
∴3y-1是上式的因式
∴(6y+1)^2*(3y+1)*y-6
=108y^4+72y^3+15y^2+y-6
=(108y^4-36y^3)+(108y^3-36y^2)+(51y^2-17y)+(18y-6)
=(3y-1)(36y^3+36y^2+17y+6)
=(3y-1)[(36y^3+24y^2)+(12y^2+8y)+(9y+6)]
=(3y-1)(3y+2)(12y^2+4y+3)
=(3x+2)(3x+5)(12x^2+28x+19)
设x+1=y
那么原式=(6y+1)^2*(3y+1)*y-6
∵y=1/3时上式=0
∴3y-1是上式的因式
∴(6y+1)^2*(3y+1)*y-6
=108y^4+72y^3+15y^2+y-6
=(108y^4-36y^3)+(108y^3-36y^2)+(51y^2-17y)+(18y-6)
=(3y-1)(36y^3+36y^2+17y+6)
=(3y-1)[(36y^3+24y^2)+(12y^2+8y)+(9y+6)]
=(3y-1)(3y+2)(12y^2+4y+3)
=(3x+2)(3x+5)(12x^2+28x+19)
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