Negative square root of nine, they might say something like this. And another way to thinkĪbout it, it's the positive, this is going to be the Radical symbol like this, people usually call Three or negative three? Well, depending on who you talk to, that's actually a reasonable Right over here, why can't this square root be positive To square the whole thing, I would also get positiveġ6, or negative five, and if I square that I Thing if I were to take negative four and I were It I would also get positive nine, and the same Now, I know that there's a nagging feeling that some of you might be having, because if I were to take negative three, and square it, and square Why, because we know thatįive squared is equal to, five squared is equal to 25. Well, what number is that, well, that's going to be equal to five. Where if I were to square it, I'd get to 25. Times itself is going to be equal to 25 or the number, What is the square root of 25 going to be? Well, this is the number that Root of 16 going to be? Well, it's going to be equal to four. Itself is equal to nine? And, well, that's going to be three. If you say the square root of nine, you're saying what times And I want you to really look at these two equations right over here, because this is the essence This is going to be equal to, this is going to be equal to, three. This way, you say, okay, what squared is equal to nine? And you would say, well, Square root of nine, and when you look at That symbol is going to be the radical here. Symbol that tells us that? So, as you can imagine,
Itself is equal to nine? We already know that answer is three, but how could we use a But what if we went the other way around? What if we started with the nine, and we said, well, what times Thing as three times three and that's going to be equal to nine. The second power is what? Three squared is what? Well, that's the same Root symbol or the root symbol or the radical is not Little bit about exponents, we'll see that the square Types of roots as well, but your question is, well, what does this thing actually mean? And now that we know a And this is used to show the square root and we'll see other Mathematics on a chalkboard, you'll almost always see a Watching a movie and someone is attempting to do fancy
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