x^2-12x+c=0
roots=-b/2a +-root(b*b-4ac)/2a
-b/2a=12/2=6
possabel reel ansers from root.....is 0, 1, 2, 3,4,5,6
6+-0=6
6+-1...5 & 7
6+-2...4 & 8
6+-3...3& 9...9 is a square but 3 is NOT
6+-4...2 & 10
6+-5...1 &11...1 is a square but 11 is NOT
6+-6=0 & 6...n o good