Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
insomniac.otaku
Group Title
I apologize if my question is not super specific. I just watched lecture 13 which is on finding particular solutions to inhomogeneous equations. In the video he mentions functions of importance, which were e^ax, sin(wx), cos(wx), e^(ax)sin(wx), e^(ax)(cos(wx)). In all of these cases, as far as I understand, he rewrote them in the form e^(a+iw). I did not in the lecture see any cases where you have something like t*e^t+4. I am not sure how I would get it in that e to the whatever form or even if it is possible. Is the technique even valid in that case?
 one year ago
 one year ago
insomniac.otaku Group Title
I apologize if my question is not super specific. I just watched lecture 13 which is on finding particular solutions to inhomogeneous equations. In the video he mentions functions of importance, which were e^ax, sin(wx), cos(wx), e^(ax)sin(wx), e^(ax)(cos(wx)). In all of these cases, as far as I understand, he rewrote them in the form e^(a+iw). I did not in the lecture see any cases where you have something like t*e^t+4. I am not sure how I would get it in that e to the whatever form or even if it is possible. Is the technique even valid in that case?
 one year ago
 one year ago

This Question is Open

Noliec Group TitleBest ResponseYou've already chosen the best response.0
I realized I'm not qualified to make a proper explanation of a technique.. :d
 one year ago

Noliec Group TitleBest ResponseYou've already chosen the best response.0
A general thought is to apply the laws of logarithms though.
 one year ago

Noliec Group TitleBest ResponseYou've already chosen the best response.0
e^(ln(t))*e^(t)+4
 one year ago

Noliec Group TitleBest ResponseYou've already chosen the best response.0
This means that t>0 though; so it might falsify the solutions in the end. If you're supposed to use imaginary stuff I got no clue as to how they apply in combination with exponential functions and their inverses.
 one year ago

insomniac.otaku Group TitleBest ResponseYou've already chosen the best response.1
Okay, so does the constant part mess up the e^(at) or is it okay
 one year ago

Noliec Group TitleBest ResponseYou've already chosen the best response.0
I'm not sure I follow what you mean by mess up the e^(at) :D
 one year ago

insomniac.otaku Group TitleBest ResponseYou've already chosen the best response.1
sorry. In the lecture he said that you can rewrite your f(x) as e^((a+iw)x). When I mentioned a I meant the complex factor and the 't' was the x. So I was wondering if the f(x) portion was okay being something like e^(a+iw)x + g, where g is a constant.
 one year ago

Noliec Group TitleBest ResponseYou've already chosen the best response.0
I stand by what I said in the first comment; I'm not qualified enough to say something. Hehe.
 one year ago

insomniac.otaku Group TitleBest ResponseYou've already chosen the best response.1
Thanks. I wouldn't have thought of the log rules thing.
 one year ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.