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Algebra and Functions Videos 140 videos

SAT Math 4.3 Algebra and Functions
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SAT Math 4.3 Algebra and Functions

SAT Math 2.5 Algebra and Functions
194 Views

SAT Math 2.5 Algebra and Functions

SAT Math 2.3 Algebra and Functions
206 Views

SAT Math 2.3 Algebra and Functions. Calculate this function.

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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

Language:
English Language

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...

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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