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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
Full Transcript
- 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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