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Playlist One-Variable Equations and Inequalities 25 videos

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SAT Math 7.4 Algebra and Functions
200 Views

SAT Math 7.4 Algebra and Functions

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SAT Math 1.3 Algebra and Functions
220 Views

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2
CAHSEE Math 6.1 Algebra and Functions
198 Views

Algebra and Functions: Drill Set 6, Problem 1. Solve the inequality.

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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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