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September 19, 2014

September 19, 2014

Posted by **Gary** on Thursday, February 21, 2013 at 4:38pm.

f(x) = 2x^3 - 3x^2 + 12x + 87 have a horizontal tangent?

- Calculus -
**JJ**, Thursday, February 21, 2013 at 5:19pmTake the derivative of the function because the derivative is equal to the slope of the tangent line.

a horizontal line has a slope of zero.

Set you derivative = 0 and solve for x. That should give you the correct value of x.

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