Question 637620
       Solution
  x = 4   or   x = 7
 x - 4 =0 or x - 7 =0
  (x - 4)(x - 7) =0
x^2 - 7x - 4x + 28 =0
 x^2 - 11x + 28 =0
hence the quadratic equation whose root are 4 and 7 = x^2 - 11x + 28 =0