Internal problem ID [5866]
Book: THEORY OF DIFFERENTIAL EQUATIONS IN ENGINEERING AND MECHANICS.
K.T. CHAU, CRC Press. Boca Raton, FL. 2018
Section: Chapter 3. Ordinary Differential Equations. Section 3.5 HIGHER ORDER ODE. Page
181
Problem number: Example 3.39.
ODE order: 4.
ODE degree: 1.
CAS Maple gives this as type [[_high_order, _linear, _nonhomogeneous]]
\[ \boxed {y^{\prime \prime \prime \prime }+4 y^{\prime \prime \prime }+3 y^{\prime \prime }-4 y^{\prime }-4 y=f \left (x \right )} \]
✓ Solution by Maple
Time used: 0.015 (sec). Leaf size: 83
dsolve(diff(y(x),x$4)+4*diff(y(x),x$3)+3*diff(y(x),x$2)-4*diff(y(x),x)-4*y(x)=f(x),y(x), singsol=all)
\[ y \left (x \right ) = \frac {\left (\left (\int f \left (x \right ) {\mathrm e}^{-x}d x \right ) {\mathrm e}^{3 x}+18 \,{\mathrm e}^{3 x} c_{1} -9 \left (\int f \left (x \right ) {\mathrm e}^{x}d x \right ) {\mathrm e}^{x}+6 x \left (\int f \left (x \right ) {\mathrm e}^{2 x}d x \right )+18 c_{3} {\mathrm e}^{x}+18 c_{4} x -2 \left (\int f \left (x \right ) \left (3 x -4\right ) {\mathrm e}^{2 x}d x \right )+18 c_{2} \right ) {\mathrm e}^{-2 x}}{18} \]
✓ Solution by Mathematica
Time used: 0.049 (sec). Leaf size: 128
DSolve[y''''[x]+4*y'''[x]+3*y''[x]-4*y'[x]-4*y[x]==f[x],y[x],x,IncludeSingularSolutions -> True]
\[ y(x)\to e^{-2 x} \left (x \int _1^x\frac {1}{3} e^{2 K[2]} f(K[2])dK[2]+e^x \int _1^x-\frac {1}{2} e^{K[3]} f(K[3])dK[3]+e^{3 x} \int _1^x\frac {1}{18} e^{-K[4]} f(K[4])dK[4]+\int _1^x-\frac {1}{9} e^{2 K[1]} f(K[1]) (3 K[1]-4)dK[1]+c_2 x+c_3 e^x+c_4 e^{3 x}+c_1\right ) \]