ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Algebra and Functions Videos 140 videos
SAT Math 2.2 Algebra and Functions. What value of y is correct?
SAT Math 5.1 Algebra and Functions 198 Views
Share It!
Description:
SAT Math 5.1 Algebra and Functions
SAT Math 5.1 Algebra and Functions
Transcript
- 00:02
And here's your shmoop du jour...
- 00:04
If 3x squared - 6 = 18, what does x squared - 2 equal?
- 00:10
And here are the possible answers...
- 00:14
Ok, so the key to this problem is figuring out how 3x squared - 6 = 18 relates
- 00:21
to x squared - 2.
Full Transcript
- 00:24
And no, he's not her second cousin.
- 00:27
First, we see that both have an x squared in their equations...
- 00:31
so let's try solving for that.
- 00:33
Start with the first equation..
- 00:35
Add 6 to both sides... so 3x squared = 24.
- 00:40
Divide both sides by 3, and we have that x squared = 8.
- 00:45
Now, we can plug x squared = 8 into the second equation:
- 00:49
x squared - 2 = 8 - 2...which equals 6.
- 00:54
The answer is A.
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...