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SAT Math 2.3 Algebra and Functions. Calculate this function.
SAT Math 8.4 Algebra and Functions 182 Views
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SAT Math 8.4 Algebra and Functions
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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