# Tag Archives | elementary algebra

## New free e-book on college algebra and calculus

Did you see my new free e-book on college algebra and calculus?  Avaialble for download from http://bookboon.com/en/elementary-algebra-and-calculus-ebook?affiliate=gaF0DistPj0yZWmkqApRII986RiHhh

## Division by zero is undefined!

A rather confused discussion of this statement appeared recently on http://www.linkedin.com/groups?home=&gid=33207&trk=anet_ug_hm Here is my take on things: Division by zero is undefined whether you work with real numbers or complex numbers. Khan’s video on the subject is a bit confusing. The consistent exposition of algebra is given in Euler’s “Elements of algebra”.  There division is defined by saying that a/b=x, a unique […]

## Order of Operations in Elementary Algebra

I find rules such as GEMDAS or PEMDAS or BODMAS somewhat misleading. There is no reason to perform addition before subtraction or multiplication before division. I would use PEMA instead (operations in parentheses first, then Exponentiation and the associated inverse operation of extracting roots and taking logs, then somewhat easier operation of Multiplication and the […]