This question introduces a bracket with a coefficient on x.
\( \begin{array}{l}\textbf{Expand and simplify:} \\ (2x + 1)(x + 3)\end{array} \)
Choose one option:
Always check the sum of the x-terms after multiplying.
Multiply each term carefully: 2x·x, 2x·3, 1·x, 1·3, then sum like terms.
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