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The correct answer is 6n3 + 7n2 + 6n - 4.
To find this answer, you need to distribute each term in the first polynomial (3n2 + 2n + 4) to each term in the second polynomial (2n - 1).
(3n2)(2n) + (3n2)(-1) + (2n)(2n) + (2n)(-1) + (4)(2n) + (4)(-1)
= 6n3 - 3n2 + 4n2 - 2n + 8n - 4
= 6n3 + n2 + 6n - 4
So, the answer is 6n3 + 7n2 + 6n - 4.