Qualification > Math
IGCSE MATHS Doubts
Baladya:
f(x)=3x-1
find f^-1f(x)
Answer is x. Can u plz show me the steps?
Thnksssssss :) ^^
Vin:
f-1(x) = x + 1
3
put 3x - 1 as x in eqn 1 ..u'll get it
(3x -1) - 1
-----------
3
= x
Baladya:
... but aren't u supposed to substitute first... like 3(3x-1)-1 cuz its f-1f(x) not ff-1(x)
haris94:
--- Quote from: Baladya on May 05, 2010, 01:39:47 pm ---... but aren't u supposed to substitute first... like 3(3x-1)-1 cuz its f-1f(x) not ff-1(x)
--- End quote ---
they hv asked f-1f(x)
so u hv to substitute the value of f(x), that is 3x-1, in the equation f-1(x)
Baladya:
oo okay :D thx man ;)
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