Answer
$$20^2-72x+7=-72x+407$$
Explanation
| $$ \begin{aligned}20^2-72x+7& \xlongequal{ }400-72x+7 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-72x+407\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{400} -72x+ \color{blue}{7} = -72x+ \color{blue}{407} $$ |
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