\[- 8 \cdot (y - 1)(y + 5) =\]
\[= - 8 \cdot (y \cdot y + 5y - y - 5) =\]
\[= - 8 \cdot \left( y^{2} + 4y - 5 \right) =\]
\[= - 8y^{2} - 32y + 40\text{.\ }\]