Jawabanmu

2014-08-28T21:00:11+07:00
A. 20y - 100
B. 5x² - x + 25x - 5
5x² + 24x - 5
c. 14x - 49 - 4x² + 14x
-4x² + 28x - 49
2014-08-28T21:01:06+07:00
A. 10x (2y - 10)
= 20xy - 100 x
b. (x+5) (5x-1)
=5x2 -1x +25x -5x
=5x2 + 19x
c.(7-2x) (2x-7)
=14x -49 -4x2 +14x
= 14x + 14x - 49 - 4x2
= 28x - 49 - 4x2
maaf knpa itu 5x2 ?
x di kali 5x hasil nya 5x pangkat 2 :3