Posted by cristy on Tuesday, January 14, 2014 at 3:04pm.
at what point do the graph of the function f(x)=(x^2)+4x1 have a horizontal tangent?

calculus  Damon, Tuesday, January 14, 2014 at 4:00pm
That is a parabola. It is horizontal at the vertex.

calculus  Damon, Tuesday, January 14, 2014 at 4:01pm
Of course you could do it the sophisticated way, where the derivative is zero
f' = 2 x + 4
= 0 when x = 2
then
y = 5
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