Functions

Definition: A function is an equation that for each value of "x" it has a value "Y".

Now a visual example:

Our function in (X)

We can assign a value to (X)

If we want our value of (X) to be "3", All we need to do is replace the (X) given in the original function.

 And you only need to solve the equation as normally you do.

Solve the necessary algebraic operations.

Done :D

Another Example, let's evaluate (X) in “1/2” .

See, So easy :D

 Another example that looks complicated but is very easy is the next one:

This is exactly the same, but now is a binomial. 

Now we have two functions:

*Caution: LOOK CAREFULLY THE SIGNS*

This small symbol tells us that the values in ​​(X) are replaced by the values ​​of G (X), but the rest of the process is the same.