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\(x^4+x^3+x+1\)
\(=x^3\left(x+1\right)+x+1=\left(x^3+1\right)\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2-x+1\right)\left(x+1\right)=\left(x+1\right)^2\left(x^2-x+1\right)\)
`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)`
\(a,x^2\left(1-x^2\right)-4-4x^2\)
\(=x^2-x^4-4-4x^2\)
\(=x^2-\left(x^4+4x^2+4\right)\)
\(=x^2-\left(x^2+2\right)^2\)
\(=\left(2x^2+2\right).\left(-2\right)\)
\(=-4\left(x^2+1\right)\)
\(x^8+3x^4+4\)
\(=\left(x^8-x^6+2x^4\right)+\left(x^6-x^4+2x^2\right)+\left(2x^4-2x^2+4\right)\)
\(=x^4\left(x^4-x^2+2\right)+x^2\left(x^4-x^2+2\right)+2\left(x^4-x^2+2\right)\)
\(=\left(x^4+x^2+2\right)\left(x^4-x^2+2\right)\)
\(4x^4+4x^3+5x^2+2x+1\)
\(=\left(4x^4+2x^3+2x^2\right)+\left(2x^3+x^2+x\right)+\left(2x^2+x+1\right)\)
\(=2x^2\left(2x^2+x+1\right)+x\left(2x^2+x+1\right)+\left(2x^2+x+1\right)\)
\(=\left(2x^2+x+1\right)^2\)
a) x8 + x + 1 = (x^2+x+1)*(x^6-x^5+x^3-x^2+1)
b) x^8 + 3x^4 + 4 = (x^4-x^2+2)*(x^4+x^2+2)
\(x^8+x+1\)
\(=x^8+x^7+x^6-x^7-x^6-x^5+x^5+x^4+x^3-x^4-x^3-x^2+x^2+x+1\)
\(=x^6\left(x^2+x+1\right)-x^5\left(x^2+x+1\right)+x^3\left(x^2+x+1\right)-x^2\left(x^2+x+1\right)+x^2+x+1\)
\(=\left(x^2+x+1\right)\left(x^6-x^5+x^3-x^2+1\right)\)
Không phân tích thành nhân tử được nhé :(