Jawabanmu

2014-06-16T17:35:33+07:00
A.x2 + 4x + 1 = 0
x2 + 4x + (2)2 = -1 + (2)2
x2 + 4x + 4 = 3
(x+2)2 = 3
x+2 = +- akar 3
x+2 = + akar 3 atau x+2 = - akar 3 

b.x2 - 2x - 3 = 0
x2 - 2x + (1)2 = 3 + (1)2
x2 - 2x + 1 = 4
(x-1)2 = 4
x-1 = 2 atau x-1 = -2

c.2x2+x-1 = 0
x2 + 1/2x - 1/2 = 0
x2 + 1/2x + (1)2 = 1/2 + (1)2
x2 + 1/2x + 1 = 1 1/2
lalu tinggal diterusin :)


tapi kalo yang c saya gabegitu yakin
iyaa, mkasih ya