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15x²+30x-120=0
(15x+60)(x-2)=0
x= -4 x=2
2. Melengkapi Kuadrat
15(x²-2x-8)=0
x²-2x+(1)² = 8+1
(x+1)² = 9
x+1 = tambah kurang 3
x= 2 x= -4
3.Rumus ABC
udah gw coba tapi kok gabisa ya? yang memiliki x² itu 15/ 30 ya thx
Semoga Membantu ^-^