Answer :

JoelWingnutHarris
obviously there is a function called 'f'... this has a pronumeral in it... f(4)=-3 means that when you replace the pronumeral in the function with 4, it equals -3... f(0)=-2 means that when you replace the pronumeral with 0 it equals -2... hope that helps
agalin920
A function is

f(x) = result

This means that given a value of x you will get a certain result 

So what your equation:
f(4) = -3
means is that the function given the x with the value 4 we get a result of 

And the other equation:
f(0) = 2 
means that the function given the x with the value 0 we get a result of 0

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