3xpangkat2+2x-7=0.tentukan nilai x

Mapel : Matematika
Kelas : VIII SMP
Materi : Persamaan Kuadrat

Pembahasan :
3x² + 2x - 7 = 0

D = b² - 4ac
D = 2² - 4(3)(-7)
D = 4 + 84
D = 88

Rumus ABC
X1 = (-b + √D)/2a
X1 = (-2 + √88)/2.3
X1 = (-2 + 2√22)/6
X1 = (-1 + √22)/3

X2 = (-b - √D)/2a
X2 = (-2 - √88)/2.3
X2 = (-2 - 2√22)/6
X2 = (-1 - √22)/3