Because the X becomes used for other- People don't want to confuse it with the letter X which gets used a lot in Algebra. I could've written this little "x" thing over here but what you're gonna see in Algebra is that the dot become much more common. And so first right over here, the way this is written, we're gonna wanna multiply the numerator out, and if you're not familiar with this little dot symbol, it's just another way of writing multiplication. We have some multiplication and some division going on. Now we start doing some interesting things, here's kind of a compound problem. So that is going to be equal to positive nine (9). This is what you knew how to do before we even talked about negative numbers: This is a positive divided by a positive. Eighteen (18) divided by two (2)! And this is a little bit of a trick question. A negative divided by a negative, just like a negative times a negative, you're gonna get a positive answer. And because I have a negative divided by a negative, the negatives cancel out, so my answer will still be positive six (6)! And I could even write a positive (+) out there, I don't have to, but this is a positive six (6). If I just said thirty (30) divided by five (5), I'd get a positive six (6). Now I have negative thirty (-30) divided by negative five (-5). But because one of these two numbers is negative, and exactly one of these two numbers is negative, then I'm going to get a negative answer. If I just said positive sixteen (16) divided by positive four (4), that would just be four (4). Now negative sixteen (-16) divided by positive four (4)- now be very careful here. So eight (8) divided by negative two (-2) is negative four (-4). So if I just said eight (8) divided by two (2), that would be a positive four (4), but since exactly one of these two numbers are negative, this one right over here, the answer is going to be negative. So eight (8) divided by negative two (-2). But let's apply and I encourage you to pause this video and try these out yourself and then see if you get the same answer that I'm going to get. And if both are negative, they'll cancel out and you'll get a positive answer. If one is negative, or the other, but not both, you'll get a negative answer. That if both are positive, you'll get a positive answer. Now what you'll see is that it's actually a very similar methodology. Now that we know a little bit about multiplying positive and negative numbers, Let's think about how how we can divide them.
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