Answer
$$1-4x+8x^2-8x+4+7x^2=15x^2-12x+5$$
Explanation
| $$ \begin{aligned}1-4x+8x^2-8x+4+7x^2& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}15x^2-12x+5\end{aligned} $$ | |
| ① | Combine like terms: $$ \color{blue}{1} \color{red}{-4x} + \color{green}{8x^2} \color{red}{-8x} + \color{blue}{4} + \color{green}{7x^2} = \color{green}{15x^2} \color{red}{-12x} + \color{blue}{5} $$ |
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