Jawabanmu

2014-03-27T20:49:56+07:00
-D : 4a = -9 : 4
-(b^2 - 4ac) : 4 = -9 : 4
a^2 - 8a = -9
a^2 - 8a + 9 = 0
(a - 9)(a + 1) = 0
a = 9 atau a = -1