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SAT Math Videos 171 videos

SAT Math 1.1 Algebra and Functions
315 Views

SAT Math 1.1 Algebra and Functions. Find an algebraic equation to correspond with the data.

SAT Math 1.1 Geometry and Measurement
719 Views

SAT Math 1.1 Geometry and Measurement. What is the circumference of the circle?

SAT Math 1.1 Numbers and Operations
280 Views

SAT Math 1.1 Numbers and Operations. How many combinations of beverage and cereal can be made?

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SAT Math 4.3 Algebra and Functions 218 Views


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Description:

SAT Math 4.3 Algebra and Functions

Language:
English Language

Transcript

00:02

And here's your math-y shmoop du jour...

00:05

If 3x squared + 2x all over 3x + 2 = 1, then x is equal to which of the following?

00:12

And here are the potential answers...

00:16

It's asking us to find what x equals to make this equation true.

00:20

This looks like a pretty messy equation...so we gotta simplify things first.

00:24

The numerator looks like it can be factored into x times 3x + 2.

00:29

Hey look... 3x + 2 is in the numerator and denominator...

00:34

...which means we can cancel those two out for all x's as long as 3x + 2 isn't zero.

00:40

3x + 2 is zero when x equals -2/3.

00:44

...so we have to remember that -2/3 is not a valid solution.

00:48

We're left with x equals one... ...and it looks like the answer is (C).

00:59

Ah, the truth has been achieved. We are going to sleep well tonight.

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