ShmoopTube
Where Monty Python meets your 10th grade teacher.
Search Thousands of Shmoop Videos
Systems of Equations Videos 73 videos
How do you solve a system of linear inequalities? Aw, man...and we thought solving a problem like Maria was tough...
Please note: If starting your own petting zoo, Shmoop recommends you stock it with animals that aren’t quite so likely to bite your hand off. Tha...
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...