Cube Numbers and Cube roots - By tecmath
Transcript
| 00:0-1 | today in this video we're going to be having a | |
| 00:01 | look at his cubic numbers and cube roots . And | |
| 00:04 | these are pretty simple . So let's just get straight | |
| 00:06 | into it . So a cube number is a number | |
| 00:08 | that is multiplied by itself . Three times . I'll | |
| 00:11 | give you an example here . So we could write | |
| 00:13 | five cubed as follows with right five to the power | |
| 00:18 | of 35 multiplied by itself three times . This means | |
| 00:21 | five times five Times five . And we call this | |
| 00:26 | a cubic number because if you were to draw a | |
| 00:29 | cube and the side length was five , The way | |
| 00:32 | that we would work at the volume of this Cube | |
| 00:34 | is we would go the length times the width times | |
| 00:37 | height , five times five times five , which is | |
| 00:42 | equal to 125 . So what about the cube root | |
| 00:47 | ? What does that mean ? The cuba is pretty | |
| 00:49 | simple . The cube root is just the opposite of | |
| 00:52 | the cube . So what we could do with a | |
| 00:55 | series of numbers here , we could say , okay | |
| 00:57 | , what is the cube root of 125 ? And | |
| 01:00 | would write this as follows , 100 and 25 And | |
| 01:03 | would use its same particular symbol for square . But | |
| 01:06 | we put a three here as well now to show | |
| 01:08 | that it's a cube root . So what number do | |
| 01:10 | we multiply by itself three times to get 125 . | |
| 01:15 | And as we see here , the answer is five | |
| 01:18 | . All right , pretty simple . Right . What | |
| 01:20 | about we go through one more example . Okay . | |
| 01:23 | What about what is two cubed ? So this means | |
| 01:27 | two times two times two to multiply by itself . | |
| 01:31 | Three times two times two is four times two is | |
| 01:35 | equal to eight . And you know what I'm gonna | |
| 01:37 | ask you next . I'm going to say , okay | |
| 01:39 | , what is The Cube Root of 8 ? So | |
| 01:43 | what number do we multiply by 8 to get ? | |
| 01:45 | So what number do we multiply three times to get | |
| 01:48 | eight ? Well , we know the answer to this | |
| 01:50 | is to So the cube root of eight is equal | |
| 01:53 | to two anyway . Nice , simple idea . Hope | |
| 01:56 | that video was of some help . We'll see you | |
| 01:58 | next time . Bye . |
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Cube Numbers and Cube roots is a free educational video by tecmath.
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