Question 457992
If b is one root, then 2b is the other.  Then from algebra, b*(2b) = 2k, or {{{b^2 = k}}}.  Also the sum of the roots must be equal to the negative of -9/1 = -9, or b+2b = -(-9) = 9, or 3b = 9, or b = 3.  This is one root.  The other root is 2*3 = 6.  {{{k = b^2 = 3^2 = 9}}}.