Answer
$$4x^2+5x+1-4x^2-6x=-x+1$$
Explanation
| $$ \begin{aligned}4x^2+5x+1-4x^2-6x& \xlongequal{ } \cancel{4x^2}+5x+1 -\cancel{4x^2}-6x \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-x+1\end{aligned} $$ | |
| ① | Combine like terms: $$ \, \color{blue}{ \cancel{4x^2}} \,+ \color{green}{5x} +1 \, \color{blue}{ -\cancel{4x^2}} \, \color{green}{-6x} = \color{green}{-x} +1 $$ |
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