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SAT Math Videos 171 videos
SAT Math 1.1 Statistics and Probability. In which of the following data sets are the arithmetic mean and the median equal?
SAT Math: Statistics and Probability Drill 1, Problem 2. If the four largest numbers in the set were doubled, what would happen to the median...
SAT Math 1.3 Statistics and Probability. Approximately what is the probability that they will be placed in alphabetical order?
SAT Math 4.3 Algebra and Functions 232 Views
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Description:
SAT Math 4.3 Algebra and Functions
Transcript
- 00:02
And here's your math-y shmoop du jour...
- 00:05
If 3x squared + 2x all over 3x + 2 = 1, then x is equal to which of the following?
- 00:12
And here are the potential answers...
- 00:16
It's asking us to find what x equals to make this equation true.
- 00:20
This looks like a pretty messy equation...so we gotta simplify things first.
Full Transcript
- 00:24
The numerator looks like it can be factored into x times 3x + 2.
- 00:29
Hey look... 3x + 2 is in the numerator and denominator...
- 00:34
...which means we can cancel those two out for all x's as long as 3x + 2 isn't zero.
- 00:40
3x + 2 is zero when x equals -2/3.
- 00:44
...so we have to remember that -2/3 is not a valid solution.
- 00:48
We're left with x equals one... ...and it looks like the answer is (C).
- 00:59
Ah, the truth has been achieved. We are going to sleep well tonight.
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