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Old 2019-01-25, 17:23   #167
S485122
 
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"Jacob"
Sep 2006
Brussels, Belgium

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Quote:
Originally Posted by Dr Sardonicus View Post
...
Inverse function
x = y3 + 2*y + 4, point (7, 1)
...
IMHO opinion your definition of the inverse function is not correct.
If y=f(x) the inverse function y=f -1(x) will be such that f(g(x))=y this is obviously not the case your calculations. (For instance it is obvious that x=y3 is not the inverse function of y=x3, since substituting x for your inverse function will give y=(y3)3=x9.)

Jacob

See Wikipedia : Inverse function for instance.
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