Question

What is (2a + b) 3rd power

Answer 1

`\begin{gathered} (2a+b)^3=(2a+b)(2a+b)^2 \\ =(2a+b)(4a^2+4ab+b^2) \\ =2a(4a^2+4ab+b^2)+b(4a^2+4ab+b^2) \\ =8a^3+8a^2b+2ab^2+4a^2b+4ab^2+b^3 \\ =8a^3+12a^2b+6ab^2+b^3 \end{gathered}`