# Composite-Find f(x) from given conditions

#1
Okay, I believe I can find the answer but substitutions are confusing me a little.

Find f(x):

If f(b/3)=b³/27

So, here’s my working out.

Last edited by KingRich; 3 months ago
0
3 months ago
#2
(Original post by KingRich)
Okay, I believe I can find the answer but substitutions are confusing me a little.

Find f(x):

If f(b/3)=b³/27

So, here’s my working out.
Looks good to be, except your last three lines should really refer to f(x) rather than f(b).
0
3 months ago
#3
(Original post by KingRich)
Okay, I believe I can find the answer but substitutions are confusing me a little.

Find f(x):

If f(b/3)=b³/27

So, here’s my working out.
It's OK. When you replace with the function goes from to .
0
#4
(Original post by old_engineer)
Looks good to be, except your last three lines should really refer to f(x) rather than f(b).
Do you mean replacing f(b) to f(x)? Would that be the correct approach.
0
3 months ago
#5
(Original post by KingRich)
Do you mean replacing f(b) to f(x)? Would that be the correct approach.
Yes. It's just a notation suggestion, not a change of approach.
0
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