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Heart of Algebra Videos 20 videos
In a laboratory experiment, heating the contents of a closed, sealed, and inelastic vessel increases the pressure caused by gas within the vessel a...
SAT Math 1.5 Numbers and Operations. How many dots would be in the 5th term of this sequence?
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SAT Math 7.4 Algebra and Functions 200 Views
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Description:
SAT Math 7.4 Algebra and Functions
Transcript
- 00:02
Put this in your calculator and shmoop it...
- 00:04
If x squared + 2x is greater than or equal to -3 and is less
- 00:09
than or equal to 3... then x cannot be which of the following?
- 00:12
And here are the potential answers...
- 00:16
Make sure you pay attention to the word CANNOT...
Full Transcript
- 00:19
Here's where they're trying to catch you...
- 00:21
We're looking for the value of x in the answer choices that makes x squared + 2x
- 00:27
OUTSIDE of the range of -3 and 3.
- 00:31
We can go ahead and just plug in the answer choices and see what we get.
- 00:36
(-3)2 + 2(-3) equals 9 minus 6 equals 3. That's true.
- 00:46
(-2)2 + 2(-2) equals 4 minus 4 equals 0. That's inside the range. True.
- 00:53
(0)2 + 2(0) equals 0. True.
- 00:57
(1)2 + 2(1) equals 1 plus 2 equals 3. True. Inside the range.
- 01:03
(3)2, that's 9, + 2(3), that's 6, Ooh, add them together that's 15.
- 01:10
Not even close! Way outside the range over here.
- 01:13
Looks like our answer's E.
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