Find the product.(3a4 + 4)2

Use (x + y)² = x² + 2xy + y², with x = 3a⁴ and y = 4. This gives (3a⁴)² + 2(3a⁴)(4) + 4² = 9a⁸ + 24a⁴ + 16, so the correct choice is 9a⁸ + 24a⁴ + 16.

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