Returns the roots of a quartic polynomial a + b x + c x^2 + d x^3 + e x^4 = 0
Returns number of roots. roots slice should have room for up to 4 elements.
doesn't pass unit-test!
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Returns the roots of a quartic polynomial a + b x + c x^2 + d x^3 + e x^4 = 0
Returns number of roots. roots slice should have room for up to 4 elements.