For what values of x does the graph of f(x)=x3+3x2+x+3 have a horizont

1.	For what values of x does the graph of f(x)=x3+3x2+x+3 have a horizontal tangent?
Answer» For what values of x does the graph of f(x)=x³+3x²+x+3 have a horizontal tangent? Solution:

Discussion