Which of the following is an odd function? f(x) = 3x2 + x f(x) = 4x3 + 7 f(x) = 5x2 + 9 f(x) = 6x3 + 2x

The first thing you should know is that a function is even if it complies with the following rule:

Therefore, the following function is odd:

To prove it, we evaluate the function for f (-x).

We have then:

Rewriting we have:

We observe that the definition is fulfilled and therefore, the function is odd.

the following is an odd function

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