ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Math III Videos 103 videos
Approximately 874 people per day wonder what a unit rate is. If you're one of them, check out our video on unit rates and how to use them. (We just...
This video covers how to use cross products to solve for a missing number in a proportion by setting that proportion with a variable over the produ...
GED Math 2.4 Rational Numbers. Lucius's favorite restaurant is how many km from his home?
SAT Math 4.3 Algebra and Functions 217 Views
Share It!
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.
Related Videos
SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?
In 2014, the unemployment rate of one county in California was 7%. In another county, the unemployment rate was 11%. Which of the following express...
Angela is making cookies for a bake sale. She expects each batch of her cookies to sell for $40. It costs her $10 to make one batch of cookies, and...