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Quadratic Equations Videos 18 videos
ACT Math Intermediate Algebra Drill 1, Problem 3. Can you find the value of a in this expression?
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Algebra and Functions: Drill 4, Problem 3. The sum of the quadratic parent function and the line given has which of the following as its graph?
SAT Math 4.3 Algebra and Functions 218 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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