How to find the roots of a cubic polynomial?
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first u have to find its first root by trail and error method then divide the first root with the cubic equation and you will get a quadratic equation split the middle term of the quadratic and you will get the other two roots
k³-(x+y+z)k²+(xy+yz±zx)k-xyz
then x,y,z are root of cubic
k³-(x+y+z)k²+(xy+yz±zx)k-xyz
then x,y,z are root of cubic
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