Question
Answer
$$\sqrt{5}\cdot(-5\sqrt{5}+4)=-25+4\sqrt{5}$$
Explanation
| $$ \begin{aligned}\sqrt{5}\cdot(-5\sqrt{5}+4)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-25+4\sqrt{5}\end{aligned} $$ | |
| ① | $$ \color{blue}{ \sqrt{5} } \cdot \left( - 5 \sqrt{5} + 4\right) = \color{blue}{ \sqrt{5}} \cdot- 5 \sqrt{5}+\color{blue}{ \sqrt{5}} \cdot4 = \\ = -25 + 4 \sqrt{5} $$ |
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