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Algebra and Functions Videos 140 videos

SAT Math 4.3 Algebra and Functions
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SAT Math 4.3 Algebra and Functions

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SAT Math 2.5 Algebra and Functions

SAT Math 2.3 Algebra and Functions
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SAT Math 2.3 Algebra and Functions. Calculate this function.

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SAT Math 2.1 Algebra and Functions 272 Views


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Description:

SAT Math 2.1 Algebra and Functions. What is g(h(4))?

Language:
English Language

Transcript

00:01

getting schmoopy with it yeah if G of N equals four N squared minus nine and H [text on screen]

00:07

of N equals the square root of n what is the G of H of four and here the

00:15

potential answers ah the suspense okay there's a lot of info crammed into this

00:20

thing but really all we have to know is what G of H of four is notice the

00:26

excessive number of parentheses in this problem as always we start with the [colorful googly-eyed parenthesis]

00:32

innermost set of parentheses H of four the problem tells us that H of any [formulas on screen]

00:37

number n is equal to the square root of n any number is equal to four so let's

00:44

plug in 4 for n the square root of four is two so if H of 4 is equal to two then

00:51

we can replace H of four with two in the equation our new equation is G of two

00:56

the problem tells us that G of n is equal to four N squared minus nine and

01:01

since we said that our new equation is G of two we can replace n with two the

01:07

four times two squared minus nine we get four times four which is equal to 16 16

01:13

minus 9 equals seven and were there C is our guy [answer C is circled]

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