\(\begin{array}{l}
{x^3} + 5{x^2} + 6x\\
 = x({x^2} + 5x + 6)\\
 = x({x^2} + 2x + 3x + 6)\\
 = x{\rm{[}}x(x + 2) + 3(x + 2){\rm{]}}\\
 = x(x + 2)(x + 3)
\end{array}\)

\(\begin{array}{l}
{x^3} + 5{x^2} + 6x\\
 = x({x^2} + 5x + 6)\\
 = x({x^2} + 2x + 3x + 6)\\
 = x{\rm{[}}x(x + 2) + 3(x + 2){\rm{]}}\\
 = x(x + 2)(x + 3)
\end{array}\)

$$\begin{gathered} {\mathrm{x}}^3+5{\mathrm{x}}^2+6\mathrm{x} \\ ={\mathrm{x}}^3+2{\mathrm{x}}^2+3{\mathrm{x}}^2+6\mathrm{x} \\ ={\mathrm{x}}^2(\mathrm{x}+2)+3\mathrm{x}(\mathrm{x}+2) \\ =(\mathrm{x}+2)({\mathrm{x}}^2+3\mathrm{x}) \end{gathered}$$

Chúc bạn học tốt

x 3 + 5 x 2 + 6 x x3+5x2+6x

= x 3 + 2 x 2 + 3 x 2 + 6 x x3+2x2+3x2+6x

= ( x 3 + 2 x 2 ) + ( 3 x 2 + 6 x ) (x3+2x2)+(3x2+6x)

= x 2 ( x + 2 ) + 3 x ( x + 2 ) x2(x+2)+3x(x+2)

= ( x 2 + 3 x ) ( x + 2 ) (x2+3x)(x+2)