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On a related note, what do you do to convince a person in a lasting
manner that the reciprocal of (1/x + 1/y) is not, in general, x+y?
x = x_0 + v_0 t + 1/2 a t^2
is one I think is OK
I've never had a student gush over the algebra that leads to delta X =
Vo t + 1/2 a t^2
But I have seen many happy faces when we explain that the Vo t is a
rectangle and the 1/2 a t^2 is a triangle, and the formula gives the
area of the trapezoid on the V vs t graph.