ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Absolute Value Functions Videos 5 videos
The easy way to remember the look of an absolute value graph is that they are always a V-shape... and “V” stands for value. Or for verisimilitu...
CAHSEE Math Algebra I: Drill 1, Problem 4. Which of the following is the solution set to the equation?
CAHSEE Math 1.5 Algebra I. Find the solution to the absolute value inequality.
CAHSEE Math 2.1 Algebra I 209 Views
Share It!
Description:
CAHSEE Math 2.1 Algebra I. What is the solution set for the equation?
Transcript
- 00:03
Here’s an unshmoopy question you’ll find on the exam somewhere you take in life...
- 00:07
at some point… Good luck.
- 00:10
What is the solution set for the equation…
- 00:12
the absolute value of x minus 2 equals the absolute value of x plus 3?
- 00:17
And here are the potential answers...
Full Transcript
- 00:23
So… what is this question asking?
- 00:24
Well, since this is an absolute value calculation, let’s start by just putting the absolute
- 00:29
value thingies into 4 buckets:
- 00:33
(x - 2) = (x + 3)
- 00:35
-(x - 2) = (x + 3)
- 00:38
(x - 2) = -(x + 3),
- 00:42
and -(x - 2) = -(x + 3).
- 00:54
The first and last… as well as the 2nd and 3rd… equations are identical once simplified…
- 00:59
…so there are actually two versions that require solving:
- 01:02
x - 2 = x + 3… and -x + 2 = x + 3.
- 01:08
In the first equation, the x's cancel, which results in no solution…
- 01:12
…while the second becomes -2x = 1, or x equals negative one-half.
- 01:18
So answer A is our guy. As in, “Absolutely fabulous.”
Related Videos
CAHSEE Math: Algebra and Functions Drill 5, Problem 3. Solve the equation.
Don’t even think about starting up your combo lemonade/fro-yo stand without first making sure you understand piecewise functions. You’re just a...
Domain and range: two terms you will learn to love (or hate with a vengeance). The domain is the set of all possible x values, and range is the set...
Functions briefly flirted with the idea of being infomercial hosts, but they didn’t shine when talking on-camera. They’re much better off in th...