www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:complex
Complex numbers | Algebra 2 | Math | Khan Academy
Complex numbers are built on the idea that we can define the number i (called "the imaginary unit") to be the principal square root of -1, or a solution to the equation x²=-1. From this starting point evolves a rich and exciting world of the number system
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In this video, I want to introduce you to the number i,which is sometimes called the imaginary, iamginary unit
What you are going to see here, and it might be a little bit difficult, to fully appreciate, is that its a more bizzare number than some of the other wacky numbers we learn in mathmatics like pi, or e. And its more bizzare because
it doesn't have a trangible value in the sense that we normally, or are used to defining numbers.
"i" is defined as the number whose square is equal to negative i.
즉, 중학,고등학교 때 공부했다 시피 i의 제곱은 -1 , 그리고 i의 4제곱은 1이겠고
"i" as being equal to the principle square root of negative one. I want to just point out to you that this is not wrong,
it might make sense to you, you know something squared is negative one, then maybe its the principle square root of negative one. And so these seem to be almost the same statement,
but I just want to amke you a little bit careful, when you do this, some people will even go so far as to say this is worng,
how taking an arbitrarily high power of "i", how you can figure out what that's going to be.
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