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b) 12a²+ 18ab
c) 6a2+19a+15
d) 10x²-33x+20
e) 6p²+p-15
5a.(-7) = -35a, urutkan => 20a²-35a
2. Caranya kayak no 1, langsung aja = 12a²+18ab
3. Caranya = kalikan satu-satu, 2a ke 3a, 2a ke 5, 3 ke 3a, 3 ke 5 (dikaliin satu-satu). Hasilnya = 6a²+10a+9a+15 = 6a²+19a+15
4. Caranya kayak no.3 (Dikaliin satu-satu), langsung aja = 10x²-25x-8x+20
= 10x²-33x+20
5. Caranya sama kayak no 3 (Dikaliin satu-satu) = 6p²-9p+10p-15 = 6p²+p-15
Semoga membantu :D