Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
lilMissMindset
Group Title
this one is tricky. help please!
y''4y'+3y=2cosx+4sinx
i'm having trouble getting the Yp!
 one year ago
 one year ago
lilMissMindset Group Title
this one is tricky. help please! y''4y'+3y=2cosx+4sinx i'm having trouble getting the Yp!
 one year ago
 one year ago

This Question is Closed

him1618 Group TitleBest ResponseYou've already chosen the best response.2
You can try substituting y = asinx + bcosx
 one year ago

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

him1618 Group TitleBest ResponseYou've already chosen the best response.2
its called th method of undetermined coefficients
 one year ago

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

lilMissMindset Group TitleBest ResponseYou've already chosen the best response.0
isn't it y=a cos x + b sinx + cx cos x + dx sin x
 one year ago

him1618 Group TitleBest ResponseYou've already chosen the best response.2
that is for a special case i think
 one year ago

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

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

lilMissMindset Group TitleBest ResponseYou've already chosen the best response.0
that is for the homo part
 one year ago

him1618 Group TitleBest ResponseYou've already chosen the best response.2
im 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
 one year ago

lilMissMindset Group TitleBest ResponseYou've already chosen the best response.0
i did that, i always get 0 for B. it's not supposed to be the answer.
 one year ago

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

lilMissMindset Group TitleBest ResponseYou've already chosen the best response.0
oh sorry. i looked at the wrong answer on my book. i am sorry. Our answer is right. Thank you!
 one year ago

him1618 Group TitleBest ResponseYou've already chosen the best response.2
Your welcome
 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.