SAT Math 7.4 Algebra and Functions

SAT Math 7.4 Algebra and Functions

AlgebraOne-Variable Equations and Inequalities
Algebra and FunctionsInequalities
Heart of AlgebraLinear inequalities in one variable (word problems)
LanguageEnglish Language
Product TypeSAT Math
SAT MathAlgebra and Functions
Systems of EquationsLinear 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

Looks like our answer's E.