Internal problem ID [3884]
Book: Ordinary differential equations and their solutions. By George Moseley Murphy.
1960
Section: Various 23
Problem number: 637.
ODE order: 1.
ODE degree: 1.
CAS Maple gives this as type [[_homogeneous, `class A`], _exact, _rational, _dAlembert]
\[ \boxed {\left (a \,x^{2}+2 b x y+c y^{2}\right ) y^{\prime }+2 y a x +y^{2} b=-k \,x^{2}} \]
✓ Solution by Maple
Time used: 0.031 (sec). Leaf size: 1666
dsolve((a*x^2+2*b*x*y(x)+c*y(x)^2)*diff(y(x),x)+k*x^2+2*a*x*y(x)+b*y(x)^2 = 0,y(x), singsol=all)
\begin{align*} y \left (x \right ) = \frac {\frac {\left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}{2 c}-\frac {2 x^{2} c_{1}^{2} \left (a c -b^{2}\right )}{c \left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}-\frac {x b c_{1}}{c}}{c_{1}} y \left (x \right ) = \frac {-\frac {\left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}{4 c}+\frac {x^{2} c_{1}^{2} \left (a c -b^{2}\right )}{c \left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}-\frac {x b c_{1}}{c}-\frac {i \sqrt {3}\, \left (\frac {\left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}{2 c}+\frac {2 x^{2} c_{1}^{2} \left (a c -b^{2}\right )}{c \left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}\right )}{2}}{c_{1}} y \left (x \right ) = \frac {-\frac {\left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}{4 c}+\frac {x^{2} c_{1}^{2} \left (a c -b^{2}\right )}{c \left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}-\frac {x b c_{1}}{c}+\frac {i \sqrt {3}\, \left (\frac {\left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}{2 c}+\frac {2 x^{2} c_{1}^{2} \left (a c -b^{2}\right )}{c \left (12 a \,x^{3} c_{1}^{3} b c -8 x^{3} b^{3} c_{1}^{3}-4 c_{1}^{3} c^{2} k \,x^{3}+4 \sqrt {4 a^{3} c \,c_{1}^{6} x^{6}-3 a^{2} b^{2} c_{1}^{6} x^{6}-6 a b c \,c_{1}^{6} k \,x^{6}+4 b^{3} c_{1}^{6} k \,x^{6}+c^{2} c_{1}^{6} k^{2} x^{6}+6 a \,x^{3} c_{1}^{3} b c -4 x^{3} b^{3} c_{1}^{3}-2 c_{1}^{3} c^{2} k \,x^{3}+c^{2}}\, c +4 c^{2}\right )^{\frac {1}{3}}}\right )}{2}}{c_{1}} \end{align*}
✓ Solution by Mathematica
Time used: 60.354 (sec). Leaf size: 744
DSolve[(a x^2+2 b x y[x]+c y[x]^2)y'[x]+k x^2+2 a x y[x]+b y[x]^2==0,y[x],x,IncludeSingularSolutions -> True]
\begin{align*} y(x)\to \frac {2^{2/3} \sqrt [3]{\sqrt {-4 x^6 \left (b^2-a c\right )^3+\left (3 a b c x^3-2 b^3 x^3+c^2 \left (-k x^3+e^{3 c_1}\right )\right ){}^2}+3 a b c x^3-2 b^3 x^3-c^2 k x^3+c^2 e^{3 c_1}}+\frac {2 \sqrt [3]{2} x^2 \left (b^2-a c\right )}{\sqrt [3]{\sqrt {-4 x^6 \left (b^2-a c\right )^3+\left (3 a b c x^3-2 b^3 x^3+c^2 \left (-k x^3+e^{3 c_1}\right )\right ){}^2}+3 a b c x^3-2 b^3 x^3-c^2 k x^3+c^2 e^{3 c_1}}}-2 b x}{2 c} y(x)\to \frac {9 i 2^{2/3} \left (\sqrt {3}+i\right ) \sqrt [3]{\sqrt {-4 x^6 \left (b^2-a c\right )^3+\left (3 a b c x^3-2 b^3 x^3+c^2 \left (-k x^3+e^{3 c_1}\right )\right ){}^2}+3 a b c x^3-2 b^3 x^3-c^2 k x^3+c^2 e^{3 c_1}}+\frac {18 \sqrt [3]{2} \left (1+i \sqrt {3}\right ) x^2 \left (a c-b^2\right )}{\sqrt [3]{\sqrt {-4 x^6 \left (b^2-a c\right )^3+\left (3 a b c x^3-2 b^3 x^3+c^2 \left (-k x^3+e^{3 c_1}\right )\right ){}^2}+3 a b c x^3-2 b^3 x^3-c^2 k x^3+c^2 e^{3 c_1}}}-36 b x}{36 c} y(x)\to \frac {-9\ 2^{2/3} \left (1+i \sqrt {3}\right ) \sqrt [3]{\sqrt {-4 x^6 \left (b^2-a c\right )^3+\left (3 a b c x^3-2 b^3 x^3+c^2 \left (-k x^3+e^{3 c_1}\right )\right ){}^2}+3 a b c x^3-2 b^3 x^3-c^2 k x^3+c^2 e^{3 c_1}}+\frac {18 i \sqrt [3]{2} \left (\sqrt {3}+i\right ) x^2 \left (b^2-a c\right )}{\sqrt [3]{\sqrt {-4 x^6 \left (b^2-a c\right )^3+\left (3 a b c x^3-2 b^3 x^3+c^2 \left (-k x^3+e^{3 c_1}\right )\right ){}^2}+3 a b c x^3-2 b^3 x^3-c^2 k x^3+c^2 e^{3 c_1}}}-36 b x}{36 c} \end{align*}