Mar 6, 2017

$10 {b}^{2} + 4 b + 4$

Explanation:

Multiply each term in the bracket by $\textcolor{red}{2}$

$\Rightarrow \textcolor{red}{2} \left(5 {b}^{2} + 2 b + 2\right)$

$= \left(\textcolor{red}{2} \times 5 {b}^{2}\right) + \left(\textcolor{red}{2} \times 2 b\right) + \left(\textcolor{red}{2} \times 2\right)$

$= 10 {b}^{2} + 4 b + 4$