Question
Answer
$$5\sqrt{27}-3\sqrt{48}=3\sqrt{3}$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}5\sqrt{27}-3\sqrt{48}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}15\sqrt{3}-12\sqrt{3} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle3}{\textcircled {3}} } }}}3\sqrt{3}\end{aligned} $$ | |
| ① | $$ 5 \sqrt{27} =
5 \sqrt{ 3 ^2 \cdot 3 } =
5 \sqrt{ 3 ^2 } \, \sqrt{ 3 } =
5 \cdot 3 \sqrt{ 3 } =
15 \sqrt{ 3 } $$ |
| ② | $$ - 3 \sqrt{48} =
-3 \sqrt{ 4 ^2 \cdot 3 } =
-3 \sqrt{ 4 ^2 } \, \sqrt{ 3 } =
-3 \cdot 4 \sqrt{ 3 } =
-12 \sqrt{ 3 } $$ |
| ③ | Combine like terms |
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