The differential equation can be written in differential form: y − 4y³ = (y² + 2x)y' M(x, y) dx+N(x, y) dy = 0 where M(x, y) = N(x, y) = -☐ help (formulas), and = help (formulas) The term M(x, y) dx + N(x, y) dy becomes an exact differential if the left hand side above is divided by y³. Integrating that new equation, the solution of the differential equation is = constant. help (formulas) Book: Section 1.8 of Notes on Diffy Qs

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