Jawabanmu

2014-09-10T19:33:16+07:00
A. 20y - 100
b. 5x² - x + 25x - 5
= 5x² + 24x - 5
c. 14x - 49 - 4x² +14x
= 28x - 4x² - 49

maaf kalo salah
2014-09-10T19:36:12+07:00
A. 10 x (2y - 10) 10y - 100 b. (x + 5) x (5x -1) 5x^2 - x + 25x - 5 5x^2 + 24x - 5 c. (7 - 2x) x (2x - 7) 14x^2 - 49 - 4x^2 + 14x 10x^2 + 14x - 49