` = (- "b" + sqrt( "b" ^2 -4* "a" * "c" ))/(2* "a" )`

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This is the equation for the solution of a second order polynomial of the form `aX^2+bX+C = 0` and the solution produces the root with the MINUS radical; i.e

from the formula `(-b +- sqrt(b^2 -4ac))/2a` this is the solution `(-b` + `sqrt(b^2 -4ac))/2a`