Faktor aljabar dari

1. x2-7x-18
= -7x+x2-18
2. 6×2+5x-21
= 5x+6×2-21
3. 2×2+7x-15
= 7x+2×2-15
4. 15×2+7x-8x
= 7x-8x+15×2
= -x+15×2

semoga bermanfaat…