Please help with this question

Question

user123 · Answer

attachment

user123 · Answer

these two//

mathmale · Answer

Unfortunately, you have neglected to provide the instructions for these problems.  From what you have done, it appears that you're trying to differentiate.  Note that the first function is a quotient, requiring you to use the quotient rule.

user123 · Answer

Yes. We are finding the derivatives...

mathmale · Answer

You have not yet applied the quotient rule to the first expression.  Do that now, please, and share all of your work.

user123 · Answer

@mathmale I am really just stuck at that point. It's these two questions that I don't know how to solve

user123 · Answer

It's finding the derivativs

user123 · Answer

thats just what I got

mww · Answer

use the power rule for derivatives.
$$\frac{ d }{ dx } x^n = nx^{n-1}$$
$$P = \frac{ 7 }{ V } = 7V^{-1} $$
$$\frac{ dP }{ dV } = - \frac{ 7 }{ V^2 }$$
Sub in V = -2

(that is what is meant by that notation, to evaluate dP/dV when V =-2) or P'( -2))
$$\frac{ dP }{ dV } |_{V=-2} $$
so find the derivative first then make a substtitution

mathmale · Answer

I believe this is the third time I've told you that the first expression is a QUOTIENT.  You cannot jump in and find the derivative of each the numerator and the denominator and present your results as the derivative.  Please look up "Quotient Rule" and then attempt to apply it to the first expression.