Question

tính: (a+2)^3 

Answer 1

\(\left(a+2\right)^3=\left(a+2\right).\left(a+2\right).\left(a+2\right)=\left(a^2+2a+2a+4\right).\left(a+2\right)=\left(a^2+4a+4\right)\left(a+2\right)=a^3+4.a^2+4a+2.a^2+8a+8\)

\(=a^3+6.a^2+12a+8\)

Answer 2

\(\left(a+2\right)^3=a^3+6.a^2+12.a+8\)