Answer
$$(3x+7)^2=9x^2+42x+49$$
Explanation
| $$ \begin{aligned}(3x+7)^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}9x^2+42x+49\end{aligned} $$ | |
| ① | Find $ \left(3x+7\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}{ 7 }$. $$ \begin{aligned}\left(3x+7\right)^2 = \color{blue}{\left( 3x \right)^2} +2 \cdot 3x \cdot 7 + \color{red}{7^2} = 9x^2+42x+49\end{aligned} $$ |
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