11. Bernuolli Differential Equations. A Bernuolli ODE is of the form y' + P(x)y = Q(x)y". (1) (a) Show that Eq (1) can be transformed into the following First-order Linear ODE by change of variable u = y-"; (b) Solve the Bernuolli ODE: du + (1 n)P(x)u = (1 n)Q(x). dx xy' + y = -xy. (2)