Derivative Questions and Solutions for y(r) = (r^2-8r)exp(-r) at r=8.00

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Homework Help Overview

The discussion revolves around finding derivatives of the function y(r) = (r^2 - 8r)exp(-r) at specific points, including r = 8.00, and determining the intervals for minimum and maximum values of the function. The subject area primarily involves calculus.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • Participants discuss the need to compute the first and second derivatives of the function and evaluate them at r = 8.00. There is uncertainty regarding the process of differentiation, with some participants questioning the original poster's background in calculus.

Discussion Status

The discussion highlights a lack of foundational knowledge in calculus from the original poster, which has led to confusion about the problem. Some participants express concern about the appropriateness of the assignment given the OP's background, while others question whether calculus is a prerequisite for the physics course.

Contextual Notes

The original poster indicates they have not learned about derivatives, raising concerns about the assignment's expectations. There is a suggestion that the physics course may require calculus knowledge, which the OP may not possess.

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Homework Statement



Consider the following function of variable r, for r greater or equal to 0.
y(r)=(r^2-8r)exp(-r)

1. Find the value of the first derivative at r=8.00
2. Find the value of the second derivative at r=8.00
3. Find the value of r where y takes its meinimum value in the r is greater or equal to 0 interval
4. Find the value of r where y takes its maximum value in the r is greater or equal to 0 interval


Please explain how you do it too! I am so lost :(


Homework Equations





The Attempt at a Solution

 
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looks like you need to take the derivative of the function y(r) and then plug in the values
 
I know but I have no idea how to do that, I am new to physics so this is all new to me.
 
This has nothing to do with physics and everything to do with calculus. Have you studied it and have you studied derivatives in particular?
 
I have not learned anything about derivatives. My Physics Professor just decides to assign us 3 derivative problems over the weekend on MasteringPhysics :(
 
I am not sure what this could possibly mean. If you have not taken any calculus, then you won't be able to solve this problem.
 
Is calculus a prerequisite for the physics course? Are you taking algebra based physics or calculus based physics?
 
The OP has not shown any effort. I am locking this thread.
 

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