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Ta có: \(1+6x-6x^2-x^3\)

\(=-x^3-6x^2+6x+1\)

\(=\left(-x^3+1\right)-6x\left(x-1\right)\)

\(=-\left(x-1\right)\left(x^2+x+1\right)-6x\cdot\left(x-1\right)\)

\(=\left(x-1\right)\left(-x^2-x-1-6x\right)\)

\(=-\left(x-1\right)\left(x^2+7x+1\right)\)

17 tháng 8 2021

\(1+6x-6x^2-x^3\)

= (1-x^3)+(6x-6x^2)

=(1-x)(1+x+x^2)+6x(1-x)

=(1-x)( 1+ x+ x^2 + 6x)

=(1-x)(1+x^2 +7x)

Đây bạn ơi!

29 tháng 7 2015

x4+6x3+7x2-6x+1

=x4-2x2+1+6x3-6x+9x2

=(x2-1)2+6x.(x2-1)+9x2

=(x2+3x-1)2

13 tháng 11 2016

a) nhận xét hệ số : 1 + 4 - 29 + 24 = 0

=> x3 + 4x2 - 29x + 24 = x2(x-1) + 5x(x-1) - 24(x-1)

= (x-1)(x2+5x-24) = (x-1)(x-3)(x+8)

b) ...

13 tháng 11 2016

a) \(x^3+4x^2-29x+24\)=\(\left(x+8\right)\left(x^2-4x+3\right)\)=\(\left(x+8\right)\left(x^2-x-3x+3\right)\)=\(\left(x+8\right)\left(x-1\right)\left(x-3\right)\)

b) \(x^4+6x^3+7x^2-6x+1\)=\(x^4+3x^3-x^2+3x^3+9x^2-3x-x^2-3x+1\)=\(x^2\left(x^2+3x-1\right)+3x\left(x^2+3x-1\right)-\left(x^2+3x-1\right)\)=\(\left(x^2+3x-1\right)\left(x^2+3x-1\right)\)=\(\left(x^2+3x-1\right)^2\)

26 tháng 7 2017

a) bt \(=\left(x-8\right)\left(x^2-x-2\right)=\left(x-8\right)\left(x+1\right)\left(x-2\right)\)

kl: ...

b) \(=\left(x+2\right)\left(x^2-8x-15\right)=\left(x+2\right)\left(x-5\right)\left(x-3\right)\)

kl:....

26 tháng 7 2017

a, \(x^3-9x^2+6x+16\)

\(=x^3-8x^2-x^2+8x-2x+16\)

\(=x^2\left(x-8\right)-x\left(x-8\right)-2\left(x-8\right)\)

\(=\left(x-8\right)\left(x^2-x-2\right)\)

\(=\left(x-8\right)\left(x^2-2x+x-2\right)\)

\(=\left(x-8\right)\left[x\left(x-2\right)+\left(x-2\right)\right]\)

\(=\left(x-8\right)\left(x-2\right)\left(x+1\right)\)

b, \(x^3-6x^2-x+30\)

\(=x^3-5x^2-x^2+5x-6x+30\)

\(=x^2\left(x-5\right)-x\left(x-5\right)-6\left(x-5\right)\)

\(=\left(x-5\right)\left(x^2-x-6\right)\)

\(=\left(x-5\right)\left(x^2-3x+2x-6\right)\)

\(=\left(x-5\right)\left[x\left(x-3\right)+2\left(x-3\right)\right]\)

\(=\left(x-5\right)\left(x-3\right)\left(x+2\right)\)

Chúc bạn học tốt!!!

6 tháng 1 2018

 = (x^4-4x^3)+(3x^3-12x^2)+(2x^2-8x)-(2x-8)

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

 = (x-4).(x^3+3x^2+2x-2)

Tk mk nha

18 tháng 8 2017

\(x^3+9x^2+6x-16\)

\(=x^3+x^2-2x+8x^2+8x-16\)

\(=x\left(x^2+x-2\right)+8\left(x^2+x-2\right)\)

\(=\left(x^2+x-2\right)\left(x+8\right)\)

\(=\left(x^2-x+2x-2\right)\left(x+8\right)\)

\(=\left[x\left(x-1\right)+2\left(x-1\right)\right]\left(x+8\right)\)

\(=\left(x-1\right)\left(x+2\right)\left(x+8\right)\)

5 tháng 7 2018

\(x^3+6x^2+11x+6=x^3+x^2+5x^2+5x+6x+6\)

\(=x^2\left(x+1\right)+5x\left(x+1\right)+6\left(x+1\right)=\left(x+1\right)\left(x^2+5x+6\right)\)

\(=\left(x+1\right)\left(x^2+2x+3x+6\right)=\left(x+1\right)\left[x\left(x+2\right)+3\left(x+2\right)\right]\)

\(=\left(x+1\right)\left(x+2\right)\left(x+3\right)\)

=(x+1)(x+2)(x+3)

25 tháng 8 2017

\(\Leftrightarrow x^3-3x^2-3x^2+9x-10x+30\)

\(\Leftrightarrow x^2\left(x-3\right)-3x\left(x-3\right)-10\left(x-3\right)\)

\(\Leftrightarrow\left(x-3\right)\left(x^2-3x-10\right)\)

\(\Leftrightarrow\left(x-3\right)\left(x-5\right)\left(x+2\right)\)

18 tháng 8 2017

\(=\left(x^3-2x^2\right)+\left(8x^2-16x\right)+\left(15x-30\right)\)

\(=x^2\left(x-2\right)+8x\left(x-2\right)+15\left(x-2\right)\)

\(=\left(x-2\right)\left(x^2+8x+15\right)\)

\(=\left(x-2\right)\left(x^2+3x+5x+15\right)\)

\(=\left(x-2\right)\left[x\left(x+3\right)+5\left(x+3\right)\right]\)

\(=\left(x-2\right)\left(x+3\right)\left(x+5\right)\)