Internal problem ID [4857]
Book: A FIRST COURSE IN DIFFERENTIAL EQUATIONS with Modeling Applications. Dennis G.
Zill. 9th edition. Brooks/Cole. CA, USA.
Section: Chapter 6. SERIES SOLUTIONS OF LINEAR EQUATIONS. Exercises. 6.3.1 page
250
Problem number: 22(b).
ODE order: 2.
ODE degree: 1.
CAS Maple gives this as type [[_Emden, _Fowler]]
Solve \begin {gather*} \boxed {x y^{\prime \prime }+y^{\prime }-7 y x^{3}=0} \end {gather*} With the expansion point for the power series method at \(x = 0\).
✓ Solution by Maple
Time used: 0.017 (sec). Leaf size: 35
Order:=6; dsolve(x*diff(y(x),x$2)+diff(y(x),x)-7*x^3*y(x)=0,y(x),type='series',x=0);
\[ y \relax (x ) = \left (\ln \relax (x ) c_{2}+c_{1}\right ) \left (1+\frac {7}{16} x^{4}+\mathrm {O}\left (x^{6}\right )\right )+\left (-\frac {7}{32} x^{4}+\mathrm {O}\left (x^{6}\right )\right ) c_{2} \]
✓ Solution by Mathematica
Time used: 0.002 (sec). Leaf size: 39
AsymptoticDSolveValue[x*y''[x]+y'[x]-7*x^3*y[x]==0,y[x],{x,0,5}]
\[ y(x)\to c_1 \left (\frac {7 x^4}{16}+1\right )+c_2 \left (\left (\frac {7 x^4}{16}+1\right ) \log (x)-\frac {7 x^4}{32}\right ) \]