MCQ
$(x + 2{y^3})\frac{{dy}}{{dx}} - y = 0$ નો ઉકેલ મેળવો.
- A$y(1 - xy) = Ax$
- ✓${y^3} - x = Ay$
- C$x(1 - xy) = Ay$
- D$x(1 + xy) = Ay$ (કે જ્યાં $A$ એ સ્વૈર અચળાંક છે )
==> $\frac{{dx}}{{dy}} = \frac{{x + 2{y^3}}}{y}$ or $\frac{{dx}}{{dy}} - \frac{x}{y} = 2{y^2}$,
which is a linear equation of the form $\frac{{dx}}{{dy}} + Px = Q$
So, integrating factor $(I.F.)$$ = {e^{ - \int_{}^{} {\frac{1}{y}dy} }}$and solution is
$x\frac{1}{y} = \int_{}^{} {\frac{1}{y}2{y^2}dy + A = {y^2} + A} $ ==> $x = {y^3} + Ay$
==> ${y^3} - x = Ay;$where $A$ can be $ - ve$or $ + ve$.
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