Jawabanmu

2014-08-23T09:01:01+07:00
2014-08-23T09:29:36+07:00
1.x²-2x+15=0
  ⇔ (x-5)(x+3)=0
 
2. 2x²-x-6=0
  ⇔ (2x+3)(x-2)=0

semoga membantu :)