Question
Answer
$$-3\sqrt{14}-7\sqrt{126}=-24\sqrt{14}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-3\sqrt{14}-7\sqrt{126}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-3\sqrt{14}-21\sqrt{14} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}-24\sqrt{14}\end{aligned} $$ | |
| ① | $$ - 7 \sqrt{126} =
-7 \sqrt{ 3 ^2 \cdot 14 } =
-7 \sqrt{ 3 ^2 } \, \sqrt{ 14 } =
-7 \cdot 3 \sqrt{ 14 } =
-21 \sqrt{ 14 } $$ |
| ② | Combine like terms |
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