What is the standard form of a polynomial -y(8y^2+y) ?

$- 8 {y}^{3} - {y}^{2}$
$\text{distribute the bracket}$
$\Rightarrow - y \left(8 {y}^{2} + y\right)$
$= - 8 {y}^{3} - {y}^{2} \leftarrow \textcolor{red}{\text{ in standard form}}$