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Math III Videos 103 videos

Unit Rate
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Approximately 874 people per day wonder what a unit rate is. If you're one of them, check out our video on unit rates and how to use them. (We just...

Solving Proportions Using Cross Products
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This video covers how to use cross products to solve for a missing number in a proportion by setting that proportion with a variable over the produ...

GED Math 2.4 Rational Numbers
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GED Math 2.4 Rational Numbers. Lucius's favorite restaurant is how many km from his home?

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SAT Math 5.4 Algebra and Functions 291 Views


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Description:

SAT Math 5.4 Algebra and Functions

Language:
English Language

Transcript

00:02

Gettin' shmoopy with it...

00:04

If g of x = the square root of x - 1 to the fourth...what is g of x + 1?

00:09

And here are the potential answers...

00:14

We're working with composite functions, so all we have to do for this is replace the

00:19

instances of x in the first equation with x + 1.

00:24

g of x + 1 = the square root of x + 1 - 1 all to the fourth.

00:33

Using the order of operations, we have to deal with the inside of the parentheses first...

00:40

So we get, x + 1 - 1 = just x.

00:44

So the square root of x to the 4th is just...x squared.

00:49

Looks like our answer's A.

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