If $$\frac{x}{a}=\frac{1}{a}-\frac{1}{x}$$ then of $$x-x^{2}$$ is
$$\frac{x}{a}=\frac{1}{a}-\frac{1}{x}$$
$$\frac{x}{a}$$ - $$\frac{1}{a}$$ = - $$\frac{1}{x}$$
$$\frac{1-x}{a}$$ = $$\frac{1}{x}$$
and hence ,
$$x-x^{2}$$ = a
So D is the correct option
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