## How do you tell if a function is even or odd?

You may be asked to “determine algebraically” whether a function is even or odd.

To do this, you take the function and plug –x in for x, and then simplify.

If you end up with the exact same function that you started with (that is, if f (–x) = f (x), so all of the signs are the same), then the function is even..

## What does it mean to add functions?

To add or subtract functions, just add or subtract the values at each point where it makes sense. If the functions are given by formulas, you can just add or subtract the formulas (it doesn’t matter whether you plug in values before or after). Search for math and science topics.

## What happens when you add functions?

The sum of these functions can be written f(x) + g(x) or as (f + g)(x). Watch what happens when these two functions are added. That’s it—the sum of the two functions is the sum of the two polynomials. Addition, subtraction, multiplication, and division will all be explained in turn.