Question

Chứng minh đẳng thức sau :

\(x.\left(x+1\right)\cdot\left(x+2\right)=x^3+3x^2+2x\)

Answer 1

\(VT=x\left(x+1\right)\left(x+2\right)\)

\(=\left(x^2+1\right)\left(x+2\right)\)

\(=x^3+3x^2+2x=VP\)

\(\Rightarrowđpcm\)

Answer 2

\(VT=x\left(x+1\right)\left(x+2\right)=\left(x^2+x\right)\left(x+2\right)\)

\(=x^3+3x^2+2x=VP\)

\(\Rightarrowđpcm\)