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Algebra and Functions Videos 140 videos

SAT Math 1.2 Algebra and Functions
359 Views

SAT Math: Algebra and Functions Drill 1, Problem 2. Based on the data in the table, what is the maximum heart rate for the average 22-year-old?

SAT Math 1.3 Algebra and Functions
220 Views

SAT Math 1.3 Algebra and Functions. How many 16 oz. bottles did she buy?

SAT Math 1.4 Algebra and Functions
207 Views

SAT Math 1.4 Algebra and Functions. Solve for x.

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SAT Math 5.1 Algebra and Functions 198 Views


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Description:

SAT Math 5.1 Algebra and Functions

Language:
English Language

Transcript

00:02

And here's your shmoop du jour...

00:04

If 3x squared - 6 = 18, what does x squared - 2 equal?

00:10

And here are the possible answers...

00:14

Ok, so the key to this problem is figuring out how 3x squared - 6 = 18 relates

00:21

to x squared - 2.

00:24

And no, he's not her second cousin.

00:27

First, we see that both have an x squared in their equations...

00:31

so let's try solving for that.

00:33

Start with the first equation..

00:35

Add 6 to both sides... so 3x squared = 24.

00:40

Divide both sides by 3, and we have that x squared = 8.

00:45

Now, we can plug x squared = 8 into the second equation:

00:49

x squared - 2 = 8 - 2...which equals 6.

00:54

The answer is A.

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