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