Jawabanmu

2014-09-01T22:25:03+07:00
(2x+y)"+(x+2y+1).(2x-1)
=(4x"+2xy+2xy+y")+(2x"-x+4xy-2y+2x-1)
=(4x"+4xy+y")+(2x"+x+4xy-2y-1)
=4x"+4xy+y"+2x"+x+4xy-2y-1
=6x"+8xy+y"+x-2y-1
ket="(pangkat 2)