$$ \begin{aligned}\sqrt{8}\cdot\sqrt{98}& \xlongequal{ }\sqrt{784} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}28\end{aligned} $$ | |
① | The square root of $ 784 $ is $ 28 $. |