a^3 + b^2 + c*x + d = 0,

x = sqrt^3{
	(	-{b^3}/{27*a^3
		+{b*c}/{6*a^3}
		-d/{2*a}
	)
	-
	sqrt^2{
		(	-{b^3}/{27*a^3}
			+{b*c}/{6*a^3}
			-d/{2*a}
		)^2
		+
		(	c/{3*a}
			-
			b^2/{9*a^2)
		)^3
	}
}
+
sqrt^3{
	(	-{b^3}/{27*a^3
		+{b*c}/{6*a^3}
		-d/{2*a}
	)
	+
	sqrt^2{
		(	-{b^3}/{27*a^3}
			+{b*c}/{6*a^3}
			-d/{2*a}
		)^2
		+
		(	c/{3*a}
			-
			b^2/{9*a^2)
		)^3
	}
}
-
b/{3*a}

  ax³ + bx² + cx + d = 0,
         __________________________________________________________________
        |                           _______________________________________
        |      b³    bc    d       |      b³    bc    d         c    b²
  x =  3| ( - ---- + --- - -- ) -  | ( - ---- + --- - -- )² + ( -- - --- )³
       \|     27a³   6a³   2a     \|     27a³   6a³   2a        3a   9a²

         __________________________________________________________________
        |                           _______________________________________
        |      b³    bc    d       |      b³    bc    d         c    b²
    +  3| ( - ---- + --- - -- ) +  | ( - ---- + --- - -- )² + ( -- - --- )³
       \|     27a³   6a³   2a     \|     27a³   6a³   2a        3a   9a²

     b
   - --
     3a