Question
Answer
$$2\sqrt{40}-3\sqrt{10}=\sqrt{10}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}2\sqrt{40}-3\sqrt{10}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}4\sqrt{10}-3\sqrt{10} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}\sqrt{10}\end{aligned} $$ | |
| ① | $$ 2 \sqrt{40} =
2 \sqrt{ 2 ^2 \cdot 10 } =
2 \sqrt{ 2 ^2 } \, \sqrt{ 10 } =
2 \cdot 2 \sqrt{ 10 } =
4 \sqrt{ 10 } $$ |
| ② | Combine like terms |
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