A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 2 years ago
this one is tricky. help please!
y''4y'+3y=2cosx+4sinx
i'm having trouble getting the Yp!
 2 years ago
this one is tricky. help please! y''4y'+3y=2cosx+4sinx i'm having trouble getting the Yp!

This Question is Closed

him1618
 2 years ago
Best ResponseYou've already chosen the best response.2You can try substituting y = asinx + bcosx

ChmE
 2 years ago
Best ResponseYou've already chosen the best response.0why would that help. I'm in diff eq as well and I wasn't thinking about that.

him1618
 2 years ago
Best ResponseYou've already chosen the best response.2its called th method of undetermined coefficients

him1618
 2 years ago
Best ResponseYou've already chosen the best response.2put it on the left side....compare with coeffs on the right fr etermining a a and b

lilMissMindset
 2 years ago
Best ResponseYou've already chosen the best response.0isn't it y=a cos x + b sinx + cx cos x + dx sin x

him1618
 2 years ago
Best ResponseYou've already chosen the best response.2that is for a special case i think

lilMissMindset
 2 years ago
Best ResponseYou've already chosen the best response.0what are the roots anyway? +i, i aren't they like, twice? then it will be case 4?

ChmE
 2 years ago
Best ResponseYou've already chosen the best response.0r^2  4r +3 = 0 (r  3)(r1) r= 3, 1

lilMissMindset
 2 years ago
Best ResponseYou've already chosen the best response.0that is for the homo part

him1618
 2 years ago
Best ResponseYou've already chosen the best response.2im telling you take y=asinx + bcosx substitute y'' and y' and y in the above eqn and compare LHS and RHS ull get 2 eqns in a and b determine a and b and you have your soln

lilMissMindset
 2 years ago
Best ResponseYou've already chosen the best response.0i did that, i always get 0 for B. it's not supposed to be the answer.

him1618
 2 years ago
Best ResponseYou've already chosen the best response.2im getting the answer as b=1, a=0 which means y=cos x y=cos x satisfies the above eqns

lilMissMindset
 2 years ago
Best ResponseYou've already chosen the best response.0oh sorry. i looked at the wrong answer on my book. i am sorry. Our answer is right. Thank you!
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
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.