2x + 1 = 0 atau 2x - 1 = 0
2x = -1 atau 2x = 1
x = - 1/2 atau x = 1/2
Cara 2: Kuadrat Sempurna
4x2 + 4x + 1 = 0
x2 + x = -1/4
x2 + x + (1/2)2 = -1/4 + (1/2)2
(x + 1/2)2 = -1/4 + 1/4
(x + 1/2)2 = 0
x + 1/2 = ± √0
2x + 1 = 0 atau 2x - 1 = 0
2x = -1 atau 2x = 1
x = - 1/2 atau x = 1/2
Cara 2: Kuadrat Sempurna
4x2 + 4x + 1 = 0
x2 + x = -1/4
x2 + x + (1/2)2 = -1/4 + (1/2)2
(x + 1/2)2 = -1/4 + 1/4
(x + 1/2)2 = 0
x + 1/2 = ± √0
Editor: Suci Annisa Caroline
Sumber: buku.kemdikbud.go.id