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= 12b+4
2. 3(6d-2c)-4(7d+c)= 18d-6c-28d-4c
= -6c-4c+18d-28d
= -10c-10d
3.7-4(5x-2)= 7-20x+8
= -20x+7-8
= -20x-1
4. 5(2-z)-2(3z-z²)= 10-5z-6z+2z²
= 2z²-11z+10
Maaf kalau salah