Jawabanmu

2014-09-13T16:49:09+07:00
A. 10 x (2y - 10) = 20y - 100
b. (X+5) x (5X-1) = X(5x-1) +5 (5x-1)=5X²-x+25x-5 =5x²+24x-5
c. (7-2X) x (2X-7) = 7(2x-7) - 2X(2X-7) = 14X-49-4X²+14X =-4X²+28X-49
2014-09-13T16:52:04+07:00
A) 10(2y - 10)
20y - 100

b) (x+5) (5x - 1)
5x² - x + 25x - 5
5x² +24x - 5

c) (7-2x)(2x-7)
14x - 49 - 4x² + 14x
4x² + 14x + 14x - 49
4x² + 28x - 49