Imaginary numbers can be a source of confusion when they are first introduced to a student, but they don’t have to be. Basically, we are trying to deal with the problem of the square root of a negative number. When we take the square root of negative one, the number is called i. This video lesson includes a brief explanation of complex numbers and a tutorial on how to use your TI-Nspire to do calculations involving complex numbers.
When you are given multiple equations and multiple variables, a graphing calculator can be a lifesaver. Since the introduction of OS 2.0 on the TI-nspire, this is something you can do easily on your calculator. This video lesson review the “elimination” or “linear-combination” method before going on to explain how to solve these problems on your nspire. If you don’t yet have OS 2.0, you’ll need to get it for this lesson.
If you’re a student of geometry or trigonometry, you’ve probably come across problems involving degrees, minutes, and seconds. This is an alternative to measuring in decimal degrees, and it works a lot like time. The conversion rates are: 1 degree = 60 minutes 1 minute = 60 seconds. As a result, 1 degree = 3,600 seconds. If you want to convert from degrees, minutes, seconds to decimal degrees, you can divide by 60 and 3600 for minutes and seconds respectively.
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