Discussion

Explanation:

A function is 

Condition 1: Even when, f(x) = f(-x)

Condition 2: Odd when, f(x) = -f(-x)

Here, f(x) = 3x3 + x and 

f(-x) = 3(-x)3 + (-x) = -3x3 - x

∴ f(-x) = -f(x)

f(x) satisfies the 2nd condition; hence it is an odd function. 

[Note: When two odd functions are added / subtracted, the resulting function will also be odd.]

Hence, 2.

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