Combine like terms for each power of x to simplify expressions.
\( \begin{array}{l}\textbf{Which expressions are equivalent to } 4x^2 + 2x - x^2 + 3x\textbf{?}\end{array} \)
Select all correct options:
Always combine same power terms first. Check your signs carefully.
Group x^2 terms together and x terms together before adding or subtracting.
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