Step 1: Write second polynomial below the first one. Making sure like terms are lined up.
$$ \begin{array}{lrr} & 4x^5 & -4x^2 \\ \color{blue}{ + } & 5x^5 & 7x^2 \\ \hline \end{array} $$Step 2: Combine like terms (add each column):
$$ \begin{array}{lrr} & 4x^5 & -4x^2 \\ \color{blue}{ + } & 5x^5 & 7x^2 \\ \hline & 9x^5 & 3x^2 \end{array} $$