TEXES 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 you're asked to solve an inequality Like | |
| 00:20 | -3 X is less than 12 . Your goal should | |
| 00:24 | be the same as it was when solving equations to | |
| 00:28 | get X by itself on one side In this problem | |
| 00:33 | , since X is being multiplied by -3 . On | |
| 00:37 | the left side of the inequality to get X by | |
| 00:40 | itself , we divide both sides by negative three . | |
| 00:49 | But here's the rule you have to watch out for | |
| 00:51 | when solving inequalities . When you divide both sides of | |
| 00:56 | an inequality by a negative number , you must switch | |
| 01:00 | the direction of the inequality sign . So this less | |
| 01:05 | than in our original problem becomes greater than in our | |
| 01:12 | second step on the left side , the negative threes | |
| 01:17 | cancel and we're left with X . And on the | |
| 01:22 | right side , 12 divided by -3 is negative four | |
| 01:28 | , so we have X is greater than negative four | |
| 01:34 | . Our next task is to Graph X is greater | |
| 01:37 | than -4 on a number line . And to do | |
| 01:41 | that , we start with an open dot at negative | |
| 01:47 | four . The reason we use an open dot at | |
| 01:51 | negative four is that X is greater than -4 , | |
| 01:55 | but it is not equal to negative for next we | |
| 02:00 | draw an arrow going to the right on our number | |
| 02:04 | line To represent all numbers greater than -4 . Finally | |
| 02:13 | , we put our answer in what is called set | |
| 02:16 | notation , which is written in the following way . | |
| 02:21 | The set of all X is such that X is | |
| 02:27 | greater than negative four . And this is our final | |
| 02:34 | answer . All this means is that if we take | |
| 02:39 | any number greater than negative four and plug it back | |
| 02:43 | in for X . In our original problem , we'll | |
| 02:47 | get a true statement . Try one . |
Summarizer
DESCRIPTION:
OVERVIEW:
TEXES Math Test Preparation - MathHelp.com is a free educational video by MathHelp.com.
This page not only allows students and teachers view TEXES Math Test Preparation - MathHelp.com videos but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.
GRADES:
STANDARDS:
