Question
Answer
$$(320x-800)^2=102400x^2-512000x+640000$$
Explanation
| $$ \begin{aligned}(320x-800)^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}102400x^2-512000x+640000\end{aligned} $$ | |
| ① | Find $ \left(320x-800\right)^2 $ using formula. $$ (A - B)^2 = \color{blue}{A^2} - 2 \cdot A \cdot B + \color{red}{B^2} $$where $ A = \color{blue}{ 320x } $ and $ B = \color{red}{ 800 }$. $$ \begin{aligned}\left(320x-800\right)^2 = \color{blue}{\left( 320x \right)^2} -2 \cdot 320x \cdot 800 + \color{red}{800^2} = 102400x^2-512000x+640000\end{aligned} $$ |
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