The value of $\int_{-2}^2 (x^3 + 3x^2) \, dx$ equals _____.
Step-by-Step Solution
Key Concept: Separate the integrand into its odd part ($x^3$) and even part ($3x^2$) over the symmetric interval $[-2, 2]$ — the odd part contributes nothing to the result.
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Correct Answer: 16