Question
Answer
$$r((9+5)^2+(3+12)^2)=r\cdot421$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}r((9+5)^2+(3+12)^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}r(14^2+15^2) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}r\cdot(196+225) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}r\cdot421\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{9} + \color{blue}{5} = \color{blue}{14} $$Combine like terms: $$ \color{blue}{3} + \color{blue}{12} = \color{blue}{15} $$ |
| ② | 3+12=153+12=15 |
| ③ | Combine like terms: $$ \color{blue}{196} + \color{blue}{225} = \color{blue}{421} $$ |
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