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ACT Aspire Math: Funception, a.k.a. Functions within Functions 4 Views


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Description:

If f(x) = x + 9 and g(y) = -3y, what is f(g(-2))?


Transcript

00:02

Okay Mass members more drilling for you Here we go

00:04

If f of axes x plus nine and g of

00:07

y is negative Three Why What is f of jesus

00:10

A bh knew to there Yeah Who a function within

00:18

a function It's like that inception of math but with

00:22

less violence right With composite functions like this we have

00:25

to start with the innermost function Well the function notation

00:29

g of negative to tells us to input the value

00:31

Negative too for why in the equation given for g

00:34

of why so g of negative too is negative Three

00:37

time thinking of two which is just six So since

00:39

g of negative two is six we're gonna replace the

00:42

innermost function with that value So stick a six right

00:45

in there The problems should no longer read half of

00:48

jesus Avner You're too but rather looking more presentable as

00:51

f of six So next we find the value of

00:54

f of six which is well Mm six is six

00:57

plus nine which is fifteen No weird dreams of inception

01:02

necessary of the answers Just d

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