$$ \begin{aligned}sqrt\cdot9-sqrt-25+sqrt\cdot25+sqrt-4& \xlongequal{ }9qrst -\cancel{qrst}-25+25qrst+ \cancel{qrst}-4 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}34qrst-29\end{aligned} $$ | |
① | Combine like terms: $$ \color{blue}{9qrst} \, \color{red}{ -\cancel{qrst}} \, \color{orange}{-25} + \color{blue}{25qrst} + \, \color{blue}{ \cancel{qrst}} \, \color{orange}{-4} = \color{blue}{34qrst} \color{orange}{-29} $$ |