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Systems of Equations Videos 73 videos
Algebra and Functions: Drill Set 4, Problem 1. Which of the graphs fits the equation?
Algebra and Functions: Drill Set 4, Problem 4. Which of the following is the graph of the expression?
Algebra and Functions: Drill Set 5, Problem 1. If this equation was graphed on coordinate axes, the graph would look like which of the following li...
SAT Math 8.4 Algebra and Functions 182 Views
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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.
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