Jawabanmu

2014-09-07T20:42:30+07:00
1 . 4(5x + 2y) = 20x + 8y = 5x + 2y

2. ( x + 1 ) ( 2x - 3 ) = 2x^2 - 3x + 2x - 3 = 2x^2 - x - 3