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Algebra and Functions Videos 30 videos
Algebra and Functions: Drill 2, Problem 2. If 2.5 pounds of ear wax were purchased, what would be the corresponding cost?
Algebra and Functions Drill 2, Problem 3. After 10 minutes of walking, how far apart are they?
Algebra and Functions Drill 2, Problem 4. What is the approximate area of this region if the square has a perimeter of 32?
CAHSEE Math 2.1 Algebra and Functions 308 Views
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Description:
Algebra and Functions: Drill Set 2, Problem 1. Simplify the expression.
Transcript
- 00:03
And here's your shmoop du jour.
- 00:06
Simplify the expression: colon... negative sign... closed parenthesis.
- 00:11
Very good. Now... simplify this expression:
- 00:15
2(x - 3) - 3(y + 2).
- 00:19
And here are the potential answers...
Full Transcript
- 00:21
And yeah, hit pause, try it yourself first.
- 00:25
OK, this question is asking, "can we distribute factors?"
- 00:29
It would be rude not to answer, wouldn't it?
- 00:31
Remember the formula for distribution of terms? It looks like this:
- 00:36
Then just follow the map...
- 00:39
...and we get 2 times x minus 6 minus 3 times y minus 6.
- 00:45
Tricky thing there -- that 3 is NEGATIVE so don't forget to bring along the negative sign.
- 00:52
This expression simplifies to 2x - 3y - 12...
- 00:56
...and the answer is C. Easy peasy. See? No reason for a frowny face.
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