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The correct answer is 6n^3 + 7n^2 + 6n - 4 in standard form.
To solve this, you can use the distributive property to multiply each term in the first expression (3n^2 + 2n + 4) by each term in the second expression (2n - 1). Then combine like terms to simplify.
(3n^2 + 2n + 4)(2n - 1)
= 3n^2 * 2n + 2n * 2n + 4 * 2n - 3n^2 * 1 - 2n * 1 - 4 * 1
= 6n^3 + 4n^2 + 8n - 3n^2 - 2n - 4
= 6n^3 + 7n^2 + 6n - 4
Therefore, the answer is 6n^3 + 7n^2 + 6n - 4 in standard form.