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f((f(f(x)) problem
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rongmon
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Mar 31, 2014; 4:48pm
f((f(f(x)) problem
if f(x) = 1/(1-x), then f(f(f(x)) equals
a. 1/(1-x)
b. x
c. 1/x
d. 1-x
thanks
Noel
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Mar 31, 2014; 4:55pm
Re: f((f(f(x)) problem
B
rongmon
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Mar 31, 2014; 5:02pm
Re: f((f(f(x)) problem
thanks..wonder why i am ending up with option a.
Noel
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Mar 31, 2014; 5:10pm
Re: f((f(f(x)) problem
Noel
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Mar 31, 2014; 5:13pm
Re: f((f(f(x)) problem
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this post
by rongmon
rongmon
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Mar 31, 2014; 6:00pm
Re: f((f(f(x)) problem
thanks-a-ton!
Ashima
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Mar 31, 2014; 7:33pm
Re: f((f(f(x)) problem
In reply to
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by rongmon
Yes it's B
rongmon
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Apr 22, 2014; 3:12am
Re: f((f(f(x)) problem
f (x) = (1-x)/(1+x), x not equal to -1
f (f (1/x)) is
a. 1
b. x
c. x^2
d. 1/x
Thanks
Homer Simpson
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Apr 22, 2014; 3:24am
Re: f((f(f(x)) problem
getting (d)
“Operator! Give me the number for 911!”
rongmon
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Apr 22, 2014; 3:28am
Re: f((f(f(x)) problem
right you are.
can you share the workings?
Homer Simpson
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Apr 22, 2014; 3:36am
Re: f((f(f(x)) problem
here it is - f(f(1/x)) = f(1-(1/x)/1+(1/x)) - substitute (1/x)
= f(x-1/x+1)
= [1 - (x-1)/(x+1)]/[1+ (x-1)/(x+1)] - substitute (x-1)/(x+1)
= (x+1 - x+1)/(x+1 + x-1)
= 1/x
“Operator! Give me the number for 911!”
rongmon
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Apr 22, 2014; 3:41am
Re: f((f(f(x)) problem
thanks!
rongmon
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Apr 22, 2014; 3:46am
Re: f((f(f(x)) problem
In reply to
this post
by Homer Simpson
the second step,
you have (x-1) as numerator right, how is that reversed in the step below
rongmon
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Apr 22, 2014; 5:11am
Re: f((f(f(x)) problem
Figured, thanks.
Homer Simpson
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Apr 22, 2014; 7:38am
Re: f((f(f(x)) problem
ok :)
“Operator! Give me the number for 911!”
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