Recent content by JoshW

I appreciate the help! but this really isn't going anywhere. So thank you I will just wait until DE's are introduced in a class.

How do I know that i want -1 and -4 as the roots?

right ok. So for the first: y=e-4x y'=-4e-4x y''=16e-4x /∴ (y"-16y)=0 if y=e-4x same thing for y=e-x (y"-y)=0 I am not sure If I have to combine the solutions to form something elsefor #2 y'=2x y"=2 /∴ (½y"+½y'+y)=0

The book we used was Boas. So we may as well have not had a textbook at all. So I need to find the roots to the equation? I am so lost. so for the first my equation will be y"+y? and the second I was correct? or for the second is it just a0x2+a1x+a2 I apologize I have trouble understanding...

Homework Statement For each Set write the differential equation they are a solution to. It is also asked to find the wronskian but I remember how to do that. (I am doing this on my own to brush up before I have to take mathphys next semester) 1. e-x,e-4x 2, 1,x,x2 Homework EquationsThe Attempt...

Homework Statement Shown In the picture. I went to the prof for help he said and i quote :" don't use laplas expansion to find the determinate, it will take you for ever." Homework Equations I don't even know how to do this. prof had no notes on this and Boas is a god awful book for learning...

it says consider N pulleys. so the tension of the one come out of the center would be the sum of the two above it? then string to the left would be just T?

Homework Statement it is Problem 3.30. Homework Equations I am not sure how to sum the forces about each consecutive pulley I have been at this for 4 hours now. It is sad I can solve the DE questions and not this. The Attempt at a Solution I had the first pulley at the top as (where y is...