Need a little help with your math homework? No problem, the Math Centre offers students video tutorials that will provide as a reference guide for self-study. Students get self-study resources targeted to the needs of individual courses, and teachers gain generic mathematics support and study materials for use with students.

In these educational videos you'll get practice and revision materials, a chance for online practice exercises in the many branches of mathematics, including algebra, arithmetic, complex numbers, differentiation, drug dose calculations, finance, functions and graphs, geometry, graphs for health sciences, guides and case studies, integration, matrices, mechanics, numeracy skills, sequences and series, statistics, trigonometry and vectors.

This instructional math video will teach you about complex numbers.

It introduces complex numbers by explaining how it is useful to be able to formally write down the square root of a negative number.

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## 1 Comment

Hello, I like to ask you something. I learned that :

For all non-negative real numbers x and y: sqrt(x*y)=sqrt(x)*sqrt(y) . In this video you got sqrt(-9)=sqrt(9*(-1))=sqrt(9)*sqrt(-1). The latter equation( sqrt(9*(-1))=sqrt(9)*sqrt(-1) ) does not comply to the rule, because -1 is negative. So I think that is incorrect.(like the -1=1 example) This is a happy example where the flaw is hidden. Please respond to me at fanusergiu@yahoo.com and correct me if I'm wrong. Thank you

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