Jawabanmu

2013-12-06T18:41:53+07:00
Luas = p . l
6x2 + x - 35 = (2x + 5) l
6x2 + x - 35
------------------  = l
2x + 5

(3x - 7) (2x + 5)
----------------------- = l
(2x + 5)

l = 3x - 7

jadi lebarnya = 3x - 7