Find the x-coordinates of all points on the graph of y=x^3 - 4x^2 + 5x at which the tangent line is horizontal.

Answer 1

Translate to math talk: find when dy/dx is zero.

y'=3x^2-8x+5=0
0=(3x-5)(x-1)

I assume you can do it from here.

Answer 2

Thanks