Posted by Roger on .
Hello, i need help doing a proof, im pretty sure on how to do it but not that way my teacher wants it. He wants it in a chart form by taking splitting up both side.
i have to show that ab=ba

Precalc 
drwls,
If a>b, it becomes ab = ab
If a<b, it becomes ba = ba
If a=b it becomes 0 = 0
So it is always true