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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!
Ta có:\(3\left(x^4+x^2+1\right)-\left(x^2+x+1\right)^2=3x^4+3x^2+3-x^4-x^2-1-2x^3-2x-2x^2\)
\(=2x^4-2x^3-2x+2=2x^3\left(x-1\right)-2\left(x-1\right)=2\left(x^3-1\right)\left(x-1\right)\)
\(=2\left(x-1\right)^2\left(x^2+x+1\right)\)
\(3\left(x^4+x^2+1\right)-\left(x^2+x+1\right)^2\)
\(=3\left(x^4+x^2+1\right)-\left(x^4+x^2+1+2x^3+2x^2+2x\right)\)
\(=\left(x^4+x^2+1\right)\left(3-2x^3-2x^2-2x\right)\)
\(3\left(x^4+x^2+1\right)-\left(x^2+x+1\right)^2\)
\(=3\left(x^2+x+1\right)\left(x+x^2+x+1\right)\)
\(=3\left(x^2+x+1\right)\left(x^2+2x+1\right)\)
\(=3\left(x^2+x+1\right)\left(x+1\right)^2\)
\(x^4+x^3+2x^2+x+1\)
\(=\left(x^4+2x^2+1\right)+x^3+x\)
\(=\left(x^2+1\right)^2+x\left(x^2+1\right)\)
\(=\left(x^2+1\right)\left(x^2+1+x\right)\)
\(x^3+1-3\left(x^2-x+1\right)\)
\(=\left(x+1\right)\left(x^2-x+1\right)-3\left(x^2-x+1\right)\)
\(=\left(x-2\right)\left(x^2-x+1\right)\)