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\(x^4+2014x^2+2013x+2014\)
\(=x^4+2014x^2+2014x-x+2014\)
\(=\left(x^4-x\right)+\left(2014x^2+2014x+2014\right)\)
\(=x\left(x^3-1\right)+2014\left(x^2+x+1\right)\)
\(=x\left(x-1\right)\left(x^2+x+1\right)+2014\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^2-x+2014\right)\)
b)\(x^8+7x^4+6\)
\(=x^8+x^4+6x^4+6\)
\(=x^4\left(x^4+1\right)+6\left(x^4+1\right)\)
\(=\left(x^4+1\right)\left(x^4+6\right)\)
b) \(x^8+7x^4+16\)
\(=\left(x^8+8x^4+16\right)-x^4\)
\(=\left[\left(x^4\right)^2+2.x^4.4+4^2\right]-x^4\)
\(=\left(x^4+4\right)^2-\left(x^2\right)^2\)
\(=\left(x^4+4-x^2\right)\left(x^4+4+x^2\right)\)
\(x^4-x^3-2x-4\)
\(=x^4-x^3-2x^2+2x^2-2x-4\)
\(=x^2\left(x^2-x-2\right)+2\left(x^2-x-2\right)\)
\(=\left(x^2-x-2\right)\left(x^2+2\right)\)
\(=\left(x^2+x-2x-2\right)\left(x^2+2\right)\)
\(=\left[x\left(x+1\right)-2\left(x+1\right)\right]\left(x^2+2\right)\)
\(=\left(x-2\right)\left(x+1\right)\left(x^2+2\right)\)
6-4x=2(3-2x)= -2(2x-3)
có chung 2x-3 nhé , PT ở thành (2x-3)^2-2(2x-3) =(2x-3)(2x-3-2) =(2x-3)(2x-1)
\(\left(2x-3\right)^2+6-4x\)
\(=4x^2-12x+9+6-4x\)
\(=4x^2-16x+15\)
\(=\left(4x^2-10x\right)-\left(6x-15\right)\)
\(=2x\left(2x-5\right)-3\left(2x-5\right)\)
\(=\left(2x-3\right)\left(2x-5\right)\)