I never learned functions and how to approach them, when i see f(x) my brain gets paralized and freezes up. Here is the question (i guessed right tho

For which of the following functions is f(a+b) = f(a) + f(b) for all positive numbers a and b?

f(x) = x^2

f(x) =x+1

f(x) =sqrt of x

f(x) = 2/x

f(x) = -3x

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