Question 710612
give roots  = -1 , 3
 sum of the roots  = -1 +3
                   =2
product of the roots  = -1*3 
                       = -3
 quadratic equation :

 formula :    x^2  - sum of the roots (x) + product of the roots  = 0
               x^2  -2x+ (-3)  =0
         x^2-2x-3 =0