steps between (a + 1)^3 and a^3 + 3a^2 + 3a + 1 ??

[deuce]

could someone please fill me in on the steps between that make (a + 1)^3 equal to a^3 + 3a^2 + 3a + 1

Thanks!!!

 

[pka]

Multiply out: (a+1)(a+1)(a+1).