Answer
$$\sqrt{98}^2=98$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}\sqrt{98}^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}(7\sqrt{2})^2 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}98\end{aligned} $$ | |
| ① | $$ \sqrt{98} =
\sqrt{ 7 ^2 \cdot 2 } =
\sqrt{ 7 ^2 } \, \sqrt{ 2 } =
7 \sqrt{ 2 }$$ |
| ② | $$ (7\sqrt{2})^2 =
7^{ 2 } \cdot \sqrt{2} ^ { 2 } =
7^{ 2 } \sqrt{2} ^2 =
7^{ 2 } \lvert 2 \rvert =
98 $$ |
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