Internal problem ID [1553]
Book: Elementary differential equations with boundary value problems. William F. Trench.
Brooks/Cole 2001
Section: Chapter 9 Introduction to Linear Higher Order Equations. Section 9.3. Undetermined
Coefficients for Higher Order Equations. Page 495
Problem number: section 9.3, problem 56.
ODE order: 4.
ODE degree: 1.
CAS Maple gives this as type [[_high_order, _linear, _nonhomogeneous]]
\[ \boxed {y^{\prime \prime \prime \prime }+2 y^{\prime \prime \prime }-3 y^{\prime \prime }-4 y^{\prime }+4 y=2 \left (x +1\right ) {\mathrm e}^{x}+{\mathrm e}^{-2 x}} \]
✓ Solution by Maple
Time used: 0.016 (sec). Leaf size: 50
dsolve(diff(y(x),x$4)+2*diff(y(x),x$3)-3*diff(y(x),x$2)-4*diff(y(x),x)+4*y(x)=2*exp(x)*(1+x)+exp(-2*x),y(x), singsol=all)
\[ y \left (x \right ) = \frac {{\mathrm e}^{-2 x} \left (\left (x^{3}+x^{2}+\left (27 c_{3} -2\right ) x +27 c_{1} +\frac {10}{9}\right ) {\mathrm e}^{3 x}+\frac {3 x^{2}}{2}+\left (27 c_{4} +2\right ) x +27 c_{2} +1\right )}{27} \]
✓ Solution by Mathematica
Time used: 0.239 (sec). Leaf size: 66
DSolve[y''''[x]+2*y'''[x]-3*y''[x]-4*y'[x]+4*y[x]==2*Exp[x]*(1+x)+Exp[-2*x],y[x],x,IncludeSingularSolutions -> True]
\[ y(x)\to \frac {1}{54} e^{-2 x} \left (3 x^2+(4+54 c_2) x+2+54 c_1\right )+\frac {1}{243} e^x \left (9 x^3+9 x^2+9 (-2+27 c_4) x+10+243 c_3\right ) \]