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\(x^8+x+1\)
\(=x^8+x^7+x^6-x^7-x^6-x^5+x^5+x^4+x^3-x^4-x^3-x^2+x^2+x+1\)
\(=x^6\left(x^2+x+1\right)-x^5\left(x^2+x+1\right)+x^3\left(x^2+x+1\right)-x^2\left(x^2+x+1\right)+x^2+x+1\)
\(=\left(x^2+x+1\right)\left(x^6-x^5+x^3-x^2+1\right)\)
\(x^8+3x^4+4\)
\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)
\(=x^4\left(x^4-x^2+2\right)+x^2\left(x^4-x^2+2\right)+2\left(x^4-x^2+2\right)\)
\(=\left(x^4+x^2+2\right)\left(x^4-x^2+2\right)\)
\(4x^4+4x^3+5x^2+2x+1\)
\(=\left(4x^4+2x^3+2x^2\right)+\left(2x^3+x^2+x\right)+\left(2x^2+x+1\right)\)
\(=2x^2\left(2x^2+x+1\right)+x\left(2x^2+x+1\right)+\left(2x^2+x+1\right)\)
\(=\left(2x^2+x+1\right)^2\)
4x3+4x4−x2−x
=4x3(x+1)−x(x+1)
=(x+1)(4x3−1)
ĐÂY NHÉ. T.I.C.K MÌNH VỚI
3(x4+x+1)-(x2+x+1)2
=3(x2+x+1)(x2-x+1)-(x2+x+1)2
=(x2+x+1)[3(x2-x+1)-(x2-x+1)
=(x2+x+1)(3x2-3x+3-x2+x-1)
=(x2+x+1)(2x2-2x+2)
=(x2+x+1)2(x2-x+1)
bạn vu cong thien làm sai rồi.
\(x^4+x^2+1=\left(x^2+x+1\right)\left(x^2-x+1\right)\)
chứ không phải là:
\(x^4+x+1=\left(x^2+x+1\right)\left(x^2-x+1\right)\)đâu!
\(x^4+x^3+x+1\)
\(=x^3\left(x+1\right)+x+1=\left(x^3+1\right)\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2-x+1\right)\left(x+1\right)=\left(x+1\right)^2\left(x^2-x+1\right)\)
`x^4 +x^3 +x+1`
`= (x^4 +x^3) + (x+1)`
`=x^3 (x+1) + (x+1)`
`= (x+1) (x^3 +1)`
`= (x+1) (x^3 +1^3)`
`= (x+1) (x+1) (x^2 - x . 1 +1^2)`
`= (x+1)^2 (x^2 - x+1)`