Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrrr} & 3x^2 & -2x & 4 \\ \color{blue}{ + } & -3x^2 & 6x & -10 \\ \hline \end{array} $$Step 2: Combine like terms (add each column):
$$ \begin{array}{lrrr} & 3x^2 & -2x & 4 \\ \color{blue}{ + } & -3x^2 & 6x & -10 \\ \hline & & 4x & -6 \end{array} $$