1) \(x^2-6x+3\)
\(=x^2-6x+9-6\)
\(=\left(x-3\right)^2-6\)
\(=\left(x-3+\sqrt{6}\right)\left(x-3-\sqrt{6}\right)\)
2) \(2m^2+10m+8\)
\(=2m^2+2m+8m+8\)
\(=2m\left(m+1\right)+8\left(m+1\right)\)
\(=\left(2m+8\right)\left(m+1\right)\)
\(=2\left(m+4\right)\left(m+1\right)\)
3) \(9x^2+6x-8\)
\(=\left(9x^2+6x+1\right)-9\)
\(=\left(3x+1\right)^2-9\)
\(=\left(3x+4\right)\left(3x-2\right)\)
4) \(x^3-5x^2-14x\)
\(=x\left(x^2-5x-14\right)\)
\(=x\left(x^2-2x+7x-14\right)\)
\(=x\left[x\left(x-2\right)+7\left(x-2\right)\right]\)
\(=x\left(x+7\right)\left(x-2\right)\)
1) x^2-6x+3
= (x^2-6x+9)-6
=(x-3)^2-6
=(x-3-căn 6)(x-3+căn 6)
2) =2(m^2+5m+4)
=2(m+1)(m+4)
3) =9x^2+6x+1-9
=(3x+1)^-9
=(3x-2)(3x+4)
4, x^3-5x^2-14x
=x(x-7)(x+2)
5, a^4+4a^2-5
=a^4+4a^2+4-9
=(a^2+2)^-9
=(a^2-1)(a^2+5)
6, x^3-7x-6
=(x-3)(x+1)(x+2).
5) \(a^4+4a^2-5\)
\(=a^4+5a^2-a^2-5\)
\(=a^2\left(a^2+5\right)-\left(a^2+5\right)\)
\(=\left(a^2-1\right)\left(a^2+5\right)\)
\(=\left(a+1\right)\left(a-1\right)\left(a^2+5\right)\)
6) \(x^3-7x-6\)
\(=x^3-x-6x-6\)
\(=x\left(x^2-1\right)-6\left(x+1\right)\)
\(=x\left(x-1\right)\left(x+1\right)-6\left(x+1\right)\)
\(=\left(x+1\right)\left(x^2-x-6\right)\)
\(=\left(x+1\right)\left(x^2+2x-3x-6\right)\)
\(=\left(x+1\right)\left[x\left(x+2\right)-3\left(x+2\right)\right]\)
\(=\left(x+1\right)\left(x+2\right)\left(x-3\right)\)
