\[ a y'(x)+b x+y'(x)^2=0 \] ✓ Mathematica : cpu = 0.0305831 (sec), leaf count = 71
DSolve[b*x + a*Derivative[1][y][x] + Derivative[1][y][x]^2 == 0,y[x],x]
\[\left \{\left \{y(x)\to \frac {1}{2} \left (-\frac {\left (a^2-4 b x\right )^{3/2}}{6 b}-a x\right )+c_1\right \},\left \{y(x)\to \frac {1}{2} \left (\frac {\left (a^2-4 b x\right )^{3/2}}{6 b}-a x\right )+c_1\right \}\right \}\] ✓ Maple : cpu = 0.029 (sec), leaf count = 49
dsolve(diff(y(x),x)^2+a*diff(y(x),x)+b*x = 0,y(x))
\[y \left (x \right ) = -\frac {a x}{2}+\frac {\left (a^{2}-4 b x \right )^{\frac {3}{2}}}{12 b}+c_{1}\]