A curve has equation y=e2xy = e^{2x}y=e2x
Find, in terms of aaa, the equation of the tangent to the curve at the point (a, e2a)\left(a,\, e^{2a}\right)(a,e2a).
Find the value of a a\,a for which this tangent passes through the origin.
Hence find the set of values of m m\,m for which the equation e2x=mxe^{2x} = mxe2x=mx has no real solutions.