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16 tháng 11 2018

a, \(x^3-x^2-4\)

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

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

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

16 tháng 11 2018

a) \(x^3-x^2-4\)

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

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

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

b) \(x^8-98x^4+1\)

\(=\left(x^4\right)^2+2\cdot x^4\cdot1+1^2-100x^4\)

\(=\left(x^4+1\right)^2-\left(10x^2\right)^2\)

\(=\left(x^4-10x^2+1\right)\left(x^4+10x^2+1\right)\)

15 tháng 7 2015

 

x8 + x4 + 1

=x8+2x4+1-x4

=(x4+1)2-x4

=(x4-x2+1)(x4+x2+1)

=(x4-x2+1)(x4+2x2+1-x2)

=(x4-x2+1)[(x2+1)2-x2]

=(x4-x2+1)(x2-x+1)(x2+x+1)

x8 + x4 + 1

= ( x)2 + 2x4 + 1 - x4

= ( x4 + 1 )2 - x4

= ( x4 + 1 - x2 ) ( x4 + 1 + x2 )

b) x7 + x2 + 1 = (x7 – x) + (x2 + x + 1) 
= x.(x6 – 1) + (x2 + x +1) 
= x.(x3 - 1).(x3 +1) + (x2 + x +1) 
= x.(x-1).(x2 + x +1).(x3 +1) + (x2 + x +1) 
= (x2 + x +1).[x.(x-1).(x3 +1) + 1] 
= (x2 + x +1).[(x2-x).(x3 +1) + 1] 
= (x2 + x +1).(x5-x4 + x2 -x + 1

2 tháng 9 2017

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

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

8 tháng 6 2015

x4+2011x2+2010x+2011

=(x4+x3+x2)+(2011x2+2011x+2011)-(x3+x2+x)

=x2(x2+x+1)+2011(x2+x+1)-x(x2+x+1)

=(x2+x+1)(x2+2011-x)

8 tháng 6 2015

x4+2011x2+2010x+2011=x4-x+2011x2+2011x+2011

                                    =x(x3-1)+2011(x2+x+1)

                                    =x(x- 1)(x2+x+1)+2011(x2+x+1)

                                   =(x2+x+1)[x(x-1)+2011]

                                    =(x2+x+1)(x2-x+2011)

14 tháng 7 2019

1) \(x^3+x^2+4\)

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

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

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

14 tháng 7 2019

2) \(x^3-2x-4\)

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

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

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

16 tháng 6 2017

a)\(3x^2-8x+4\)

\(=3x^2-2x-6x+4\)

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

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

b)\(4x^4+81\)

\(=4x^4+36x^2+81-36x^2\)

\(=\left(2x^2+9\right)^2-36x^2\)

\(=\left(2x^2-6x+9\right)\left(2x^2+6x+9\right)\)

c)\(x^8+98x^4+1\)

\(=\left(x^8+2x^4+1\right)+96x^4\)

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

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

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

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

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

d)\(x^4+6x^3+7x^2-6x+1\)

\(=x^4+3x^3-x^2+3x^3+9x^2-3x-x^2-3x+1\)

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

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

30 tháng 12 2020

Có:\(x^4+64y^4\)

\(=\left(x^4+16x^2y^2+64y^4\right)-16x^2y^2\)

\(=\left(x^2+8y^2\right)^2-\left(4xy\right)^2\)

\(=\left(x^2+4xy+8y^2\right)\left(x^2-4xy+8y^2\right)\)

Linz

30 tháng 12 2020

= 64y4 + 32xy3 + 8y2x - 32xy3  -16x2y-  4x3y + 8x2y+4x3y +x4

= 8y2 ( 8y2 + 4xy + x2 ) - 4xy ( 8y2 + 4xy + x2 ) + x ( 8y2 + 4xy + x2 )

= ( 8y2 - 4xy + x) ( 8y2 + 4xy + x2 )