MAT244-2013S > Final Exam
FE-3
Victor Ivrii:
\begin{equation*}
y^{(4)} -3y''-4y = \sin (t)+8 t.
\end{equation*}
Jason Hamilton:
solve homogeneous-> roots are i,-i,2,-2
Yh=c1 e^2t +c2 e^-2t +c3 cost +c4 sint
Yp-> undetermined coefficients-> Yp= Atcost +Btsint +Ct +D
evaulate polynomial terms => C=-2. D=0
evaulate sinusoidal terms => A=1/10 B=0
Y= c1 e^2t +c2 e^-2t +c3 cost +c4 sint + (1/10)tcost -2t
Jason Hamilton:
Also, I MIGHT have used 'x' instead of 't' on the test, would I lose marks if I used the wrong variable?
Victor Lam:
i did this
Benny Ho:
Solutions
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