Posted by Drew on Tuesday, November 16, 2010 at 6:18pm.
Find the xcoordinates of all points on the graph of y = x^3  4x^2 + 5x at which the tangent line is parallel to 2y  10x  7 = 0

Calculus  Reiny, Tuesday, November 16, 2010 at 6:50pm
the slope of the given line is 5
so find dy/dx for the cubic
and set that result equal to 5
you will get a quadratic which factors nicely.
let me know what values of x you got.

Calculus  Drew, Tuesday, November 16, 2010 at 6:54pm
I got x=10/3 and x=6

Calculus  Reiny, Tuesday, November 16, 2010 at 6:57pm
3x^2  8x + 5 = 5
x(3x8) = 0
x = 0 or x = 8/3
I don't understand how you got your answers.
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