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\(x^4+x^3+x^2-1\)
\(=x^3\left(x+1\right)+\left(x+1\right)\left(x-1\right)\)
\(=\left(x+1\right)\left(x^3+\left(x-1\right)\right)\)
Ủng hộ nha ^ _ ^
\(x^4+x^3+x^2-1\)
\(=x^2\left(x^2-1\right)+x^2-1\)
\(=\left(x^2+1\right)\left(x^2-1\right)\)
\(x^5+x^4-x^3+x^2-x+2\)
\(=x^5-x^4+x^3-x^2+x+2x^4-2x^3+2x^2-2x+2\)
\(=x\left(x^4-x^3+x^2-x+1\right)+2\left(x^4-x^3+x^2-x+1\right)\)
\(=\left(x+2\right)\left(x^4-x^3+x^2-x+1\right)\)
\(x^5+x^4-x^3+x^2-x+2\)
\(=x^5+2x^4-x^4+2x^3-x^3+2x^2-x^2+2x-x+2\)
\(=x^4\left(x-2\right)-x^3\left(x-2\right)-x^2\left(x-2\right)-x\left(x-2\right)-\left(x-2\right)\)
\(=\left(x-2\right)\left(x^4-x^3-x^2-x-1\right)\)
Ta có: \(x^3-x^2-x-2\)
\(=x^3-2x^2+x^2-2x+x-2\)
\(=x^2\left(x-2\right)+x\left(x-2\right)+\left(x-2\right)\)
\(=\left(x-2\right)\left(x^2+x+1\right)\)
đa thức trên không thể phân tích dù tớ đã vào Cốc Cốc mà cốc cốc cũng bó tay
\(x^5+x^4+x^3+x^2+x+1\)
\(=\left(x^5+x^4+x^3\right)+\left(x^2+x+1\right)\)
\(=x^3\left(x^2+x+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^3+1\right)\left(x^2+x+1\right)\)
\(=\left(x+1\right)\left(x^2-x+1\right)\left(x^2+x+1\right)\)
Ta có: \(x^5+x^4+x^3+x^2+x+1\)
\(=x^4\left(x+1\right)+x^2\left(x+1\right)+\left(x+1\right)\)
\(=\left(x+1\right)\left(x^4+x^2+1\right)\)
\(=\left(x+1\right)\left(x^4+2x^2+1-x^2\right)\)
\(=\left(x+1\right)\left\lbrack\left(x^2+1\right)^2-x^2\right\rbrack=\left(x+1\right)\left(x^2-x+1\right)\left(x^2+x+1\right)\)
Đặt A=\(\left(x+3\right)^4+\left(x+5\right)^4-2\)
\(=\left\lbrack\left(x+4\right)-1\right\rbrack^4+\left\lbrack\left(x+4\right)+1\right\rbrack^4-2\)
Đặt b=x+4
=>\(A=\left(b-1\right)^4+\left(b+1\right)^4-2\)
\(=\left(b^2-2b+1\right)^2+\left(b^2+2b+1\right)^2-2\)
\(=\left(b^2+1\right)^2-4b\left(b^2+1\right)+4b^2+\left(b^2+1\right)^2+4b\left(b^2+1\right)+4b^2-2\)
\(=2\left(b^2+1\right)^2+8b^2-2\)
\(=2\left\lbrack\left(b^2+1\right)^2+4b^2-1\right\rbrack\)
\(=2\cdot\left\lbrack b^4+2b^2+1+4b^2-1\right\rbrack=2\left(b^4+6b^2\right)=2b^2\left(b^2+6\right)\)
\(=2\left(x+4\right)^2\left\lbrack\left(x+4\right)^2+6\right\rbrack\)