lib/polynomials/formulas.rb in polynomials-0.4.2 vs lib/polynomials/formulas.rb in polynomials-0.4.3

@@ -38,12 +38,12 @@
     end
 
     def roots_of_quadratic_function(a,b,c)
       p = b/a
       q = c/a
-      denom = (p/2.0)**2 - q
-      return Set[] if denom < 0
-      root = Math.sqrt(denom)
+      radicand = (p/2.0)**2 - q
+      return Set[] if radicand < 0
+      root = Math.sqrt(radicand)
       Set.new([:+,:-].map{ |operator| (-(p/2.0)).send(operator, root)}.map { |n| n.round(10) })
     end
 
     def roots_of_quartic_function(*args)
       a,b,c,d,e = args.map { |n| n/args.first }