Given that dy =0 dx when x=1 for the curve y=x³+ 3x2 – 9x +6 d?y Find dx- and hence find which of the following is true when x=1: d²y A <0 and x=1 is a maximum point dx2 d²y <0 and x=1 is a minimum point dx2 (B) d?y >0 and x=1 is a maximum point dx2 d²y >0 and x=1 is a minimum point dx2 D d²y E =0 and x=1 is a point of inflection

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