tolong dibantu ya kkak

Kelas 10 Matematika
Bab Persamaan Kuadrat

3α = x
α = x/3

x² + 3x - 4 = 0
(x/3)² + 3 . x/3 - 4 = 0
x²/9 + x - 4 = 0

◎◎ dikali 9 ◎◎

x² + 9x - 36 = 0