Answer
$$1.03x(x+320)=x^2+320x$$
Explanation
| $$ \begin{aligned}1.03x(x+320)& \xlongequal{ }x(x+320) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}x^2+320x\end{aligned} $$ | |
| ① | Multiply $ \color{blue}{x} $ by $ \left( x+320\right) $ $$ \color{blue}{x} \cdot \left( x+320\right) = x^2+320x $$ |
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