Answer
$$k^2-4k+7+k^2+9k-3=2k^2+5k+4$$
Explanation
| $$ \begin{aligned}k^2-4k+7+k^2+9k-3& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}2k^2+5k+4\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{k^2} \color{red}{-4k} + \color{green}{7} + \color{blue}{k^2} + \color{red}{9k} \color{green}{-3} = \color{blue}{2k^2} + \color{red}{5k} + \color{green}{4} $$ |
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