Answer:
See below.
Explanation:
You can try factoring by grouping in 2 sets of 2 terms.
Here we might try grouping the first and third term and the 2nd and last terms:
3x^3 + 5x + 6x^2 + 10
= 3x^3 + 6x^2 + 5x + 10
= 3x^2(x + 2) + 5(x + 2)
(x + 2) is common so the factors are:
(3x^2 + 5)(x + 2).