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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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SAT Math 5.2 Algebra and Functions 200 Views


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Description:

SAT Math 5.2 Algebra and Functions

Language:
English Language

Transcript

00:02

And here's your shmoop du jour...

00:04

If g(n) = 4n squared - 9 and h(n) = the square root of n,

00:10

what is g of h of n?

00:14

Here are the possible answers...

00:18

g of h of n? No, those parentheses aren't just there to distract us.

00:26

Actually, they tell us we're working with composite functions.

00:30

To solve this problem, we need to plug h of n in for the n in the g of n equation:

00:37

to get 4 times the square root of n squared minus 9.

00:40

The square root of n squared simplifies to n...

00:44

so our equation becomes g of h of n equals 4n minus 9.

00:49

Looks like our answer's B.

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