Answer
$$dy = 2{e^{2x}}dx$$
Work Step by Step
$$\eqalign{
& f\left( x \right) = {e^{2x}} \cr
& {\text{Differentiate}} \cr
& f'\left( x \right) = \frac{d}{{dx}}\left[ {{e^{2x}}} \right] \cr
& f'\left( x \right) = 2{e^{2x}} \cr
& {\text{Write in the form }}dy = f'\left( x \right)dx \cr
& dy = 2{e^{2x}}dx \cr} $$