Answer
$$7x^2-4x+9-5x^2-5x+10=2x^2-9x+19$$
Explanation
| $$ \begin{aligned}7x^2-4x+9-5x^2-5x+10& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2x^2-9x+19\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{7x^2} \color{red}{-4x} + \color{green}{9} \color{blue}{-5x^2} \color{red}{-5x} + \color{green}{10} = \color{blue}{2x^2} \color{red}{-9x} + \color{green}{19} $$ |
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