Is the function even or odd? How to tell

The video tutorial explains the concept of even functions, highlighting that if you plug in negative X into an even function, you will get the same result as plugging in positive X. It uses the quadratic function as a primary example, demonstrating that even functions are symmetric about the Y-axis. The tutorial emphasizes understanding the properties and rules of even functions rather than memorizing them.

Explain the significance of plugging in negative values for X in the context of even functions.

What conclusion can be drawn about the values obtained from an even function when substituting positive and negative inputs?