Jawabanmu

2014-09-01T20:13:18+07:00
1. x kuadrat - 7x - 18
   = x kuadrat - 9x + 2x - 18
   = x (x-9) + 2 (x-9)
   = (x+2) (x-9)

2. 2x kuadrat + 3x - 2
   = 2x kuadrat + 4x - x - 2
   = 2x (x+2) - 1 (x+2)
   = (2x-1) (x+2)

3. 25x kuadrat - 16 = (5x-4) (5x+4)
1 1 1
2014-09-01T20:13:52+07:00
1. x² - 7x - 18 = ( x + 2 ) ( x - 9)
2. 2x² + 3x - 2 = ( 2x - 1 ) ( x + 2 )
3. 25x² - 16 = ( 5x - 4) ( 5x + 4 )
1 2 1