Question
Answer
$$-7\sqrt{21}\cdot(4-\sqrt{7})=-28\sqrt{21}+49\sqrt{3}$$
Explanation
| $$ \begin{aligned}-7\sqrt{21}\cdot(4-\sqrt{7})& \xlongequal{ }-(28\sqrt{21}-49\sqrt{3}) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-28\sqrt{21}+49\sqrt{3}\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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Simplify Radical Expression