-2(3x + 4y - 5) caranya bgmana...????

-2(3x + 4y -5) =
-6x -8y +10

^(+).(+) = (+),
  (+).(-) = (-)
  (-).(-) =(+)
*semoga membantu

-2(3x + 4y -5)

1. -2.3x = -6x
2. -2.4y = -8y
3. -2.-5 = 10

jadi , -6x - 8y + 10