Intro to Basic Functions

Basic Functions  
  Before we get to the concept of Functions, we must have a recap on what functions look like:

 Most functions will be named after the letter "F", but that doesn't mean that we can't use "g" or "z" as a function name.

What goes into the function is put inside the parenthesis "( )" after the name of the function
 f(x) = x² shows us that function "f" takes "x" and squares it.

A simple example would be:

            f(x) = x²

• An input of 4 

• Becomes an output of 16

  So...  f(4) = (4)²
     f(4) = 16 

Reminder: An "x" is just a place holder. You don't need to worry about "x", it just shows where the input will be held or placed after you have found the input or placed the given input of "x".

"x" is just like the function name "f" and can be named after the letter "n" or "q". 
"x" will just be a guide to where the input will be.

Example:
 f(u) = u² + 1 + 8
 f(5) = (5)² + 1 + 8
 f(5) = 25 + 1 + 8 
 f = 34

 p(x) = x³ + 4
 p(2) = (2)³ + 4
 p(2) =  8 + 4 
 p = 12

 r(v) = (7v - 10) + (8v - 12)
 r(3) = (7(3) - 10) + (8(3) - 12)
 r(3) = (21 - 10) + (24 - 12)
 r(3) = 11 - 12 
 r = - 1