Answer
$$3x^2-2x-5+2x^2+x-10=5x^2-x-15$$
Explanation
| $$ \begin{aligned}3x^2-2x-5+2x^2+x-10& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}5x^2-x-15\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{3x^2} \color{red}{-2x} \color{green}{-5} + \color{blue}{2x^2} + \color{red}{x} \color{green}{-10} = \color{blue}{5x^2} \color{red}{-x} \color{green}{-15} $$ |
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