Answers

2016-07-11T02:11:14+08:00
   x²+ 6x + 9 = 0
   the discriminant is         b² - 4ac
    thus    6² - (4 .1 .9)          /   a = 1,  b  =6   &   c  = 9
               36 - 36  =   0
     therefore the roots are       real,  rational,  and equal
1 5 1