Vba function problem

I don't know what i did wrong but when I'm trying to use those two Functions they are not running.

Here is my exercise :

2.JPG


And here is my function:

1PNG.JPG

Using standard Excel

Antoine: With A1 = 8.0897, B1 = 1582.271, C1 = 239.726 D1 = 50

Formula:

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which gives 425.04, different to your 416.6

Option B

A1 = 200, B1 = 0.5, C1 = 4

Formula:

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= 27.0676

As UDF's

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Also posted here: https://www.mrexcel.com/board/thread...oblem.1173426/

Thanks Rory

@Zaneta


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