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\(x^8+x^4+1\)

\(=x^8+x^7+x^6-x^7-x^6-x^5+x^5+x^4+x^3-x^3-x^2-x+x^2+x+1\)

\(=\left(x^8+x^7+x^6\right)-\left(x^7+x^6+x^5\right)+\left(x^5+x^4+x^3\right)-\left(x^3+x^2+x\right)+\left(x^2+x+1\right)\)

\(=x^6\left(x^2+x+1\right)-x^5\left(x^2+x+1\right)+x^3\left(x^2+x+1\right)-x\left(x^2+x+1\right)+\left(x^2+x+1\right)\)

\(=\left(x^2+x+1\right)\left(x^6-x^5+x^3-x+1\right)\)

\(x^5-x^4-1\)

\(=x^5-x^4+x^3-x^3+x^2-x-x^2+x-1\)

\(=\left(x^5-x^4+x^3\right)-\left(x^3-x^2+x\right)-\left(x^2-x+1\right)\)

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

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

21 tháng 9 2017

a )  

b) 

c) x^5 - x^4 - 1 

= x^5 - x^3 - x² - x^4 + x² + x + x^3 - x - 1 

= x²( x^3 - x - 1 ) - x( x^3 - x - 1 ) + ( x^3 - x - 1 ) 

= ( x² - x + 1)( x^3 - x - 1 )

d) 

Ta có : \(x^8+14x^4+1\)

\(=x^8+2.x^4.7+1\)

\(=x^8+2.x^4.7+49-48\)

\(=\left(x^4+7\right)^2-48\)

\(=\left(x^4+7-\sqrt{48}\right)\left(x^4+7+\sqrt{48}\right)\)

3 tháng 6 2018

a/\(=\left(x^4+1\right)^2+12x^4=\left(x^4+1\right)^2+4x^2\left(x^4+1\right)+4x^4-4x^2\left(x^4+1\right)+8x^4\)

\(=\left(x^4+1+2x^2\right)^2-4x^2\left(x^4+1-2x^2\right)=\left(x^4+2x^2+1\right)-\left(2x^3-2x\right)^2\)

\(=\left(x^4+2x^3+2x^2-2x+1\right)\left(x^4-2x^3+2x^2+2x+1\right)\)

b/\(=\left(x^4+1\right)^2+96x^4=\left(x^4+1\right)^2+16x^2\left(x^4+1\right)+64x^4-16x^2\left(x^4+1\right)+32x^4\)

\(=\left(x^4+1+8x^2\right)^2-16x^2\left(x^4+1-2x^2\right)=\left(x^4+8x^2+1\right)-\left(4x^3-4x\right)^2\)

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

24 tháng 3 2019

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

\(=\left(x^4+x^2+1\right)\left(x^4-x^2+1\right)\)

\(=\left(x^2-x+1\right)\left(x^2+x+1\right)\left(x^4-x^2+1\right)\)

24 tháng 3 2019

\(=\left(x^4+x^3+x^2\right)-\left(x^3-2007x^2-2007x-2008\right)\)

\(=x^2\left(x^2+x+1\right)-\left[x\left(x^2+x+1\right)-2008\left(x^2-x-1\right)\right]\)

\(=x^2\left(x^2+x+1\right)-\left(x^2+x+1\right)\left(x-2008\right)\)

\(=\left(x^2+x+1\right)\left(x^2-x+2008\right)\)

9 tháng 11 2015

a,x+x4 +1=x6 .x+x.x+1=x6 .x2-x2 +x.x-x+1+x+x2=x2.(x6-1)+x.(x3-1)+1+x+x2=x2.(x3-1).(x3+1)+x.(x-1).(x2+x+1)+1+x+x2

9 tháng 11 2015

a,x8+x4+1

23 tháng 6 2017

mk chỉ lm đc câu b thôi !

mk k viết đề đâu nha !:

=(x4-8x2+16)+(5x2-20x+20)+(3x2+12x+12)+15

=(x2-4)2+5(x-2)2+3(x-2)2+15

=[(x-2)2+3][(x-2)2+5]

=(x2-4x+7)(x2+4x+9)

đúng 100 %

11 tháng 12 2019

\(x^8+x^4+1\)

\(=\left(x^4\right)^{^2}+2x^4+1-x^4\)

\(=\left(x^4+1\right)^2-x^4\)
\(=\left(x^4+1\right)^{^2}-\left(x^2\right)^{^2}\)
\(=\left(x^4+1-x^2\right)\left(x^4+1+x^2\right)\)

20 tháng 7 2019

\(A=x^5+x^4+1\)

\(A=x^5+x^4+x^3+1-x^3\)

\(A=x^3.\left(x^2+x+1\right)+\left(1-x\right).\left(x^2+x+1\right)\)

\(A=\left(x^3-x+1\right).\left(x^2+x+1\right)\)

1 tháng 11 2018

\(a,4x^4+4x^3-x^2-x=4x^3\left(x+1\right)-x\left(x+1\right)\)

\(=\left(x+1\right)\left(4x^3-x\right)\)

\(=x\left(x+1\right)\left(4x^2-1\right)\)

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