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# Derivatives

For this equation

E= (-C/r) + D(-r/P)

(Where c, D, and P are constants)

Do the following procedure:

1. Differentiate E with respect to r and set the resulting expression equal to zero.
2. Solve for r0 in terms of C, D and P.

Here is where I am at in the problem:

I have obtained a derivative (and I'm looking for conformation that this is the correct derivative):

E' = C/r2 + (D(-r/P)lnD)(-1/P).

Then I set E equal to 0: 0= C/r2 + (D(-r/P)lnD)(-1/P)

Now I need to solve for r0 in terms of C, D and P. At this point I'm stuck. Either I don't have the algebra skills or I got the derivative wrong.

#### Solution Preview

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For this equation E= (-C/r) + D(-r/P), (Where c, D, and P are constants)

Do the following procedure:

1. Differentiate E with respect to r and set the resulting expression equal to zero. ...

#### Solution Summary

The derivative equation constants are discussed. The expert differentiates E with respect to r and set the resulting expression equal to zero.

\$2.19