The answer is x=27. your welcome. :)
At first let us choose the 5 points
at x = 0, y = 0
The first point is (0, 0)

We will choose a = 1/2
The points are
(-2, -4)
(-1, -1/2)
(0, 0)
(1, 1/2)
(2, 4)
It is not differentiable at x=1 since the slope of the tangent line as x -> 1 from the right is 1 while the slope of the tangent line as x->1 from the left is -1
I am pretty sure that it is 9 ounces less, I hope this helps