Need help with a derivative solution

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In summary, when substituting x = au, to show that d F(x)/dx = (1/a) (dF/du), you need to take the derivatives of both sides and consider what is constant and what is not. Furthermore, note that dx = a * du.
  • #1
Dyatlov
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Hello.
We have the derivative of a function: d F(x)/dx. If we substitute x = au, how can I show that d F(x)/dx = (1/a) (dF/du) ?
 
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  • #2
Dyatlov said:
Hello.
We have the derivative of a function: d F(x)/dx. If we substitute x = au, how can I show that d F(x)/dx = (1/a) (dF/du) ?

When you do a substitution, you take the derivatives of both sides (hint: take into account what is constant and what is not). If you do this, you'll immediately come to what you need to show.
 
  • #3
Thanks for the answer, did it and got:
(dF/da) (dF/du) = (dF/da) u + (dF/du) a = (dF/du) a, since a is a constant. What am I missing here?
 
  • #4
Dyatlov said:
Thanks for the answer, did it and got:
(dF/da) (dF/du) = (dF/da) u + (dF/du) a = (dF/du) a, since a is a constant. What am I missing here?

As I previously said, note that ##dx = a\cdot du##.
 
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  • #5
Thanks, got it now.
 
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FAQ: Need help with a derivative solution

1. What is a derivative solution?

A derivative solution is a mathematical concept that represents the rate of change of a function at a specific point. It is essentially the slope of the tangent line to the function at that point.

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