Question
Answer
$$-4\sqrt{11}\cdot(-4-\sqrt{11})=16\sqrt{11}+44$$
Explanation
| $$ \begin{aligned}-4\sqrt{11}\cdot(-4-\sqrt{11})& \xlongequal{ }-(-16\sqrt{11}-44) \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}16\sqrt{11}+44\end{aligned} $$ | |
| ① | Remove the parenthesis by changing the sign of each term within them. |
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