Posted by Drew on Tuesday, November 16, 2010 at 6:05pm.
Find the xcoordinates of all points on the graph of y=x^3  4x^2 + 5x at which the tangent line is horizontal.

Calculus  bobpursley, Tuesday, November 16, 2010 at 6:09pm
Translate to math talk: find when dy/dx is zero.
y'=3x^28x+5=0
0=(3x5)(x1)
I assume you can do it from here. 
Calculus  Drew, Tuesday, November 16, 2010 at 6:10pm
Thanks