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#1 2013-01-23 09:42:24

skylor
Guest

evaluate the expressions using the graph

Ok I'm having a really hard time understanding this

I'll try to reproduce the graph

x     5   6    7     8      9
f(x)  8  7     5     8      6
g(x) 9   8    7     6      7


find f(g(6))

g(f(7))

f(f(6))

g(g(9))

#2 2013-01-23 12:45:22

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 88,672

Re: evaluate the expressions using the graph

Hi skylor;


Please read this:

http://www.mathsisfun.com/sets/function … ition.html

f(g(6)) = 8

g(f(7)) = 9

f(f(6)) = 5

g(g(9)) = 7


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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#3 2013-01-25 15:29:11

John E. Franklin
Member
Registered: 2005-08-29
Posts: 3,562

Re: evaluate the expressions using the graph

w h(w) j(w)
2   4       1
3   9       1.5
4   16       2
9   81       4.5
16 256     8
j(w) means takeHalfOf(w)
h(w) means square(w)
So j(h(2) = 2 because h(2) = 4 because 2 to the 2 power is 4 and j(4) is half of 4 or 2 back for the answer.

So j(j(j(j(32)=2 because j(32) = 32/2 = 16 and j(16) = 16/2 = 8, and j(8) = 8/2 or 4. and j(4) is 2.


igloo myrtilles fourmis

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