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Absolute Value Functions Videos 5 videos
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. What is the solution set for the equation?
CAHSEE Math 2.1 Algebra I 209 Views
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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.”
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