Question: F(x)=x^3 +3x^2 +3x How do you find intervals at which f(x) is increasing and decreasing. Then sketch graph and add horizontal tangent lines. I got

F(x)=x^3 +3x^2 +3x How do you find intervals at which f(x) is increasing and decreasing. Then sketch graph and add horizontal tangent lines. I got f'(x)=3x^2+6x + 3 and then x= -1 ;would the local extrema be (-1,-1) and therefore increasing at (-1,-1)? Idk about decreasing

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