Question
Answer
$$r((7+5)^2+(10+9)^2)=r\cdot505$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}r((7+5)^2+(10+9)^2)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}r(12^2+19^2) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}r\cdot(144+361) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}r\cdot505\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7} + \color{blue}{5} = \color{blue}{12} $$Combine like terms: $$ \color{blue}{10} + \color{blue}{9} = \color{blue}{19} $$ |
| ② | 10+9=1910+9=19 |
| ③ | Combine like terms: $$ \color{blue}{144} + \color{blue}{361} = \color{blue}{505} $$ |
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