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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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