ODE
\[ y'''(x)-y''(x)-2 y'(x)=0 \] ODE Classification
[[_3rd_order, _missing_x]]
Book solution method
TO DO
Mathematica ✓
cpu = 0.164838 (sec), leaf count = 28
\[\left \{\left \{y(x)\to c_1 \left (-e^{-x}\right )+\frac {1}{2} c_2 e^{2 x}+c_3\right \}\right \}\]
Maple ✓
cpu = 0.015 (sec), leaf count = 18
\[[y \left (x \right ) = \textit {\_C1} +\textit {\_C2} \,{\mathrm e}^{-x}+\textit {\_C3} \,{\mathrm e}^{2 x}]\] Mathematica raw input
DSolve[-2*y'[x] - y''[x] + y'''[x] == 0,y[x],x]
Mathematica raw output
{{y[x] -> -(C[1]/E^x) + (E^(2*x)*C[2])/2 + C[3]}}
Maple raw input
dsolve(diff(diff(diff(y(x),x),x),x)-diff(diff(y(x),x),x)-2*diff(y(x),x) = 0, y(x))
Maple raw output
[y(x) = _C1+_C2*exp(-x)+_C3*exp(2*x)]