CHSPE Math Test Preparation - MathHelp.com - By MathHelp.com
Transcript
| 00:0-1 | The following is a selected video from your teacher.com where | |
| 00:03 | you can browse over 450 complete math lessons with example | |
| 00:07 | videos , interactive practice problems , self tests and more | |
| 00:11 | . Try a complete lesson today at your teacher dot | |
| 00:14 | com . When an equation has a squared term in | |
| 00:22 | it , such as x squared minus 12 , X | |
| 00:26 | minus 28 equals zero . It's called a polynomial equation | |
| 00:33 | . The rule for solving a polynomial equation Is to | |
| 00:37 | first set it equal to zero . Then factor Since | |
| 00:42 | this equation is already set equal to zero . Our | |
| 00:45 | first step is to factor the left side two , | |
| 00:50 | factor X squared minus 12 X minus 28 . We | |
| 00:55 | need the factors of negative 28 that add to negative | |
| 00:59 | 12 Which are -14 and positive too . So we | |
| 01:06 | have X -14 Times X-plus two . If you need | |
| 01:16 | a review of how to factor a trim no meal | |
| 01:18 | like X squared minus 12 , x minus 28 . | |
| 01:23 | Go back to the previous section . So we have | |
| 01:27 | x minus 14 times X plus two equals zero and | |
| 01:34 | whenever two terms are multiplied together to equal zero , | |
| 01:40 | this means that either one or the other must equal | |
| 01:45 | zero . So if x minus 14 times X plus | |
| 01:50 | two equals zero , Then either X -14 equals zero | |
| 01:58 | . Yeah or X plus two equals zero , Solving | |
| 02:06 | each equation . From here we add 14 to both | |
| 02:09 | sides of our first equation . Yeah . To get | |
| 02:16 | x equals 14 And we subtract two from both sides | |
| 02:22 | of our second equation To get x equals -2 . | |
| 02:28 | So this equation has two solutions 14 and negative two | |
| 02:35 | and notice that we put our answer in set notation | |
| 02:40 | . Mhm Yeah . |
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