For what values of x does the graph of:
F(X) = X^3 + 3X^2 + X + 3 have a horizontal tangent?
I don't know how to approach this but I got 0 as one of the values of X. I'm not really sure if there are other values.
If you have a graphing calculator like a TI-83 you can type in the equation for the derivative and then hit 2nd --> Calc to find the zeros. I'm guessing your teacher probably wants to see work and it doesn't hurt to practice by hand, but it's a good way to check your answers