Answer
$$(a-3)^2=a^2-6a+9$$
Explanation
| $$ \begin{aligned}(a-3)^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}a^2-6a+9\end{aligned} $$ | |
| ① | Find $ \left(a-3\right)^2 $ using formula. $$ (A - B)^2 = \color{blue}{A^2} - 2 \cdot A \cdot B + \color{red}{B^2} $$where $ A = \color{blue}{ a } $ and $ B = \color{red}{ 3 }$. $$ \begin{aligned}\left(a-3\right)^2 = \color{blue}{a^2} -2 \cdot a \cdot 3 + \color{red}{3^2} = a^2-6a+9\end{aligned} $$ |
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