Composite-Find f(x) from given conditions

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KingRich
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#1
Report Thread starter 3 months ago
#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.

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Last edited by KingRich; 3 months ago
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old_engineer
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#2
Report 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).
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RDKGames
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#3
Report 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 b with 3x the function goes from f(b/3) to f(x).
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KingRich
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#4
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#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.
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old_engineer
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#5
Report 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.
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