Jawabanmu

2014-09-04T20:58:26+07:00
2r-7s-r+=2s
=2r-r-7s+2s
=(r-5s)(r-2s)
=r^2 - 2rs -5rs +10s^2
=r^2 - 7rs + 10s^2
2 4 2
2014-09-04T20:58:30+07:00
(2r² - 18rs - 14s²)(r-2s)
2r³ - 18r²s - 14rs² - 2r²s - 36rs² - 14 s³
2r³ - 14s³ - 20r²s - 50rs²
1 2 1