An electric field varies in space according to this

An electric field varies in space according to this equation E(x) = a x e^-bx, where a = 1.353 N(Cm)^-1 and b = 0.847 m^-1.

a) For what value of x, xmax, does the electric field have its largest value?

b) What is the potential difference between the points at x = 0 and x = xmax?

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