$$ \begin{aligned}5\sqrt{10}\cdot(-2-33)& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5\sqrt{10}\cdot(-35) \xlongequal{ } \\[1 em] & \xlongequal{ }5\cdot(-35)\sqrt{10} \xlongequal{ } \\[1 em] & \xlongequal{ }-175\sqrt{10}\end{aligned} $$ | |
① | Combine like terms |