Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrrr} & 6h^2 & h & 8 \\ \color{red}{ - } & & h & 4 \\ \hline \end{array} $$Step 2: Change ALL the signs in the second row.
$$ \begin{array}{lrrr} & 6h^2 & h & 8 \\ \color{red}{ - } & & -h & -4 \\ \hline \end{array} $$Step 3: Combine like terms (add each column):
$$ \begin{array}{lrrr} & 6h^2 & h & 8 \\ \color{red}{ - } & & -h & -4 \\ \hline & 6h^2 & 2h & 12 \end{array} $$