Find the product.(3a4 + 4)2

Square the binomial by multiplying it by itself: (3a⁴ + 4)(3a⁴ + 4). Using (x + y)² = x² + 2xy + y² gives (3a⁴)² + 2(3a⁴)(4) + 4² = 9a⁸ + 24a⁴ + 16. This matches choice C.

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