\[b_{1} = - 4;\ \ q = 2:\]
\[S_{5} = \frac{- 4 \cdot \left( 2^{5} - 1 \right)}{2 - 1} =\]
\[= - 4 \cdot (32 - 1) = - 4 \cdot 31 =\]
\[= - 124.\]