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OpenStudy (anonymous):
A 3rd order polynomial touches the x-axis in the origin. The tangent in P(3/9) passes through the origin. I get the 3 equations: (1): d=0 (2): c=0 (3): 9=27a+9b+3c+d The forth is somehow supposed to look like this: (4): 3=27a+6b+3c Someone please explain the (4)??!!
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