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= 2x + 6+4x+12 per (x+3) (x-3)
= 2x + 4x+6+12 per (x+3)(x-3)
= 6x + 18 per (x+3) (x-3)
2. 5 per (x+3) + 5 (x²-9) = 5 (x-3) + 5 per (x-3) ( x+3) = 5x + 15 + 5 per (x-3)(x+3)
| = 5x + 20 per (x-3) (x+3)
selisih dua kuadrat=> (x-3) (x+3)