ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos

SAT Math 8.4 Algebra and Functions 182 Views


Share It!


Description:

SAT Math 8.4 Algebra and Functions

Language:
English Language

Transcript

00:02

Here's your shmoop du jour, brought to you by the Square Root Symbol.

00:06

Not to be confused with the Square Root Beer Symbol.

00:13

If 2 times the quantity 3x + 4 = -16,

00:16

then the square root of x squared is equal to what?

00:23

We need to start by getting x by itself in the first equation...

00:27

We can divide both sides of the equation by 2 to get 3x + 4 = -8.

00:34

Subtract 4 from both sides... 3x = -12.

00:39

Divide both sides by 3 and we have x = -4.

00:43

Now, we can plug -4 into the second equation...

00:46

The square root of -4 squared is the same as the square root of 16...

00:50

which is just 4. So we have our answer.

00:53

That's using our head.

Related Videos

SAT Math 2.1 Geometry and Measurement
2779 Views

SAT Math 2.1 Geometry and Measurement. What is the measure of angle z in terms of x and y?

SAT Math 9.4 Algebra and Functions
1300 Views

SAT Math 9.4 Algebra and Functions

SAT Math 9.2 Algebra and Functions
377 Views

SAT Math 9.2 Algebra and Functions

SAT Math: Identifying an Equation for the Average of Two Percentages
23 Views

In 2014, the unemployment rate of one county in California was 7%. In another county, the unemployment rate was 11%. Which of the following express...

SAT Math: Which Equation Represents Profit?
13 Views

Angela is making cookies for a bake sale. She expects each batch of her cookies to sell for $40. It costs her $10 to make one batch of cookies, and...