derivatives

kynetikg01 · 2006-02-28 17:10:39

hello everyone. i was doin some calculus and got stuck on this problem
f(x)= 10 - x

find the : f^(-1)(x)= ?

written as f'(x) just replace the ' w/ the -1

what does that mean? is that the inverse or somethIN?
i've been dealing w/ derivatives
-thanks

Last edited by kynetikg01 (2006-02-28 17:12:13)

naturewild · 2006-02-28 17:56:56

I'm positive that it's asking for an inverse. But I dont know why you are dealing with inverse when you have learnt derivatives.

krassi_holmz · 2006-02-28 18:06:14

Ya it's inverse function.
Write it like this:
y=10-x
-x=y-10
x=10-y
This is the inverse function:
f^(-1)(y)=10-y
[corrected]

Last edited by krassi_holmz (2006-03-01 04:30:18)

mathsyperson · 2006-03-01 04:15:17

I think there's a mistake in there.

y = 10-x
x+y = 10
x = 10-y

Therefore, f[sup]-1[/sup](x) = 10-x.

krassi_holmz · 2006-03-01 04:28:58

Mathsy's right.

krassi_holmz · 2006-03-01 04:30:37

[corrected]

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