ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Passport to Advanced Math Videos 52 videos

SAT Math 9.2 Algebra and Functions
377 Views

SAT Math 9.2 Algebra and Functions

SAT Math 9.4 Algebra and Functions
1300 Views

SAT Math 9.4 Algebra and Functions

Multiplying Polynomials to Find an Unknown Constant
3 Views

In the equation above, if a, b, and c are all constants, what is c?

See All

SAT Math 9.2 Algebra and Functions 377 Views


Share It!


Description:

SAT Math 9.2 Algebra and Functions

Language:
English Language

Transcript

00:02

Put this in your calculator and shmoop it.

00:05

If the square root of 25 minus x squared equals 3, then what is one possible positive value of x?

00:15

So we want to find this “x” fellow. In other words… we want to isolate it.

00:20

The side of the equation that contains x is under a square root.

00:23

We can undo this situation by squaring both sides, getting us 25 – x squared = 9.

00:31

Then, we subtract 25 from each side to further isolate x. Now we’re working with –x squared = -16.

00:40

Both sides are negative, so we can multiply both sides by -1 to get x squared = 16.

00:46

From here, pretty simple. Take the square root of both sides, and we get 4.

00:50

But don’t forget it can be positive OR negative.

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: 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...

SAT Math: Using Time and Distance to Calculate Speed
14 Views

Liz leaves her home to drive on a straight highway that leads directly across town for a job interview. At 8:00 a.m., she has driven 5 miles from h...