Question
Answer
$$2x^2+19x^2=21x^2$$
Explanation
| $$ \begin{aligned}2x^2+19x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}21x^2\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{2x^2} + \color{blue}{19x^2} = \color{blue}{21x^2} $$ |
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