Answer
$$(y+5)^2=y^2+10y+25$$
Explanation
| $$ \begin{aligned}(y+5)^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}y^2+10y+25\end{aligned} $$ | |
| ① | Find $ \left(y+5\right)^2 $ using formula. $$ (A + B)^2 = \color{blue}{A^2} + 2 \cdot A \cdot B + \color{red}{B^2} $$where $ A = \color{blue}{ y } $ and $ B = \color{red}{ 5 }$. $$ \begin{aligned}\left(y+5\right)^2 = \color{blue}{y^2} +2 \cdot y \cdot 5 + \color{red}{5^2} = y^2+10y+25\end{aligned} $$ |
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