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Question

Find a cubic function
y = ax3 + bx2 + cx + d
whose graph has horizontal tangents at the points
9 years ago

Answers

bobpursley
well, horizontal tangent,y'=0
y'=0=3ax^2+bx+c
so you solve that quadratic equation

x=(-b+-sqrt(b^2-4ac))/2a
9 years ago

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