Posted by **cristy** on Tuesday, January 14, 2014 at 3:04pm.

at what point do the graph of the function f(x)=(x^2)+4x-1 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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