or the curve y = ax3 + bx2 + 12x - 7, what values of a and b will make the tangents to the curve at x = 2 and x = 3 horizontal? (A a==, b= - 5 3 (B 15 a =-, b= - 2 O .--- ,b=- 1 3 (D) 3 b=- a = --

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