42.1.3 problem 3.6 (b)

Internal problem ID [6825]
Book : Advanced Mathematical Methods for Scientists and Engineers, Bender and Orszag. Springer October 29, 1999
Section : Chapter 3. APPROXIMATE SOLUTION OF LINEAR DIFFERENTIAL EQUATIONS. page 136
Problem number : 3.6 (b)
Date solved : Monday, January 27, 2025 at 02:31:14 PM
CAS classification : [[_2nd_order, _with_linear_symmetries]]

\begin{align*} y^{\prime \prime }-2 x y^{\prime }+8 y&=0 \end{align*}

Using series method with expansion around

\begin{align*} 0 \end{align*}

With initial conditions

\begin{align*} y \left (0\right )&=0\\ y^{\prime }\left (0\right )&=4 \end{align*}

✓ Solution by Maple

Time used: 0.001 (sec). Leaf size: 14

Order:=6; 
dsolve([diff(y(x),x$2)-2*x*diff(y(x),x)+8*y(x)=0,y(0) = 0, D(y)(0) = 4],y(x),type='series',x=0);
 

\[ y = 4 x -4 x^{3}+\frac {2}{5} x^{5}+\operatorname {O}\left (x^{6}\right ) \]

✓ Solution by Mathematica

Time used: 0.001 (sec). Leaf size: 19

AsymptoticDSolveValue[{D[y[x],{x,2}]-2*x*D[y[x],x]+8*y[x]==0,{y[0]==0,Derivative[1][y][0] ==4}},y[x],{x,0,"6"-1}]
 

\[ y(x)\to \frac {2 x^5}{5}-4 x^3+4 x \]