# Algebra

# Finding the DOMAIN of a function

The domain of a function is one of the most interesting topics in Algebra that many students are confused of. It is always partnered with the "range" of the function.

Domain, simply put, is the set of all permissible values of X while the range are the permissible values of Y.

The process is actually looking for EXCEPTIONS in the possible values of X; which means, the domain of a function is the SET of ALL REAL numbers EXCEPT for the non-permissible values. Domain notation may vary on how the topic is tought, but the logic is the same.

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# Algebra Basics: Combining Like Terms

In algebra, we will be dealing with "terms" most of the times. By definition, a term can be any of the following:

- a CONSTANT like 2, 25, x,
- the product of a number (which is called coefficient) and a variable like –6
*x*, 21*y,* - the product of two or more variables: e.g.
*a*2,*xy*, 3*y*2, 5*xy*

The video above describes the process of combining "like terms" to simplify an algebraic expressions. Please feel free to comment below or post questions if you need assistance.

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# Introducing i, the imaginary number

When studying Algebra, you will surly encounter the imaginary number, i. What is i? How to calculate expressions involving i?

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# Formulas when working with Fractions

The following is a comprehensive list of basic math formulas that are commonly used when doing basic math computation.

When converting a mixed-number to an improper fraction, use this formula:

When converting an improper fraction to a mixed-number format, here is the formula: **Read more »**

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