Answer
$$-4x^2+4x-6x^2-8=-10x^2+4x-8$$
Explanation
| $$ \begin{aligned}-4x^2+4x-6x^2-8& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-10x^2+4x-8\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{-4x^2} +4x \color{blue}{-6x^2} -8 = \color{blue}{-10x^2} +4x-8 $$ |
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