# SAT Math 7.4 Algebra and Functions

SAT Math 7.4 Algebra and Functions

 Algebra One-Variable Equations and Inequalities Algebra and Functions Inequalities Heart of Algebra Linear inequalities in one variable (word problems) Language English Language Product Type SAT Math SAT Math Algebra and Functions Systems of Equations Linear Inequalities

### 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