ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Playlist Algebra and Functions Test Questions 74 videos
CAHSEE Math Algebra and Functions: Drill Set 1, Problem 1. At this rate, what is the total cost of 10 songs?
SAT Math 8.4 Algebra and Functions 182 Views
Share It!
Description:
SAT Math 8.4 Algebra and Functions
Transcript
- 00:02
Here's your shmoop du jour, brought to you by the Square Root Symbol.
- 00:06
Not to be confused with the Square Root Beer Symbol.
- 00:13
If 2 times the quantity 3x + 4 = -16,
- 00:16
then the square root of x squared is equal to what?
- 00:23
We need to start by getting x by itself in the first equation...
Full Transcript
- 00:27
We can divide both sides of the equation by 2 to get 3x + 4 = -8.
- 00:34
Subtract 4 from both sides... 3x = -12.
- 00:39
Divide both sides by 3 and we have x = -4.
- 00:43
Now, we can plug -4 into the second equation...
- 00:46
The square root of -4 squared is the same as the square root of 16...
- 00:50
which is just 4. So we have our answer.
- 00:53
That's using our head.
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...