ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Algebra and Functions Videos 140 videos
SAT Math 2.3 Algebra and Functions. Calculate this function.
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...