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A curve is defined by

y=ex2x,x≠0
  1. Find the equation of the normal to the curve at the point where x=2.

  2. Prove that the curve has a minimum point when x=1.


y=12x−1ex

For (b), it is not enough to demonstrate that dydx=0 when x=0. You must use the second derivative test.


The point (1,γ) lies on the normal from (a). Given that

γ=pe2+qe−2,p,q∈Q

find the vale of

qp