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b. 12x - 28
c. 18a^2b + 10a^2b^2 - 8ab^2
keterangan :
^ = pangkat
= (7 × 2x) (7 × 5)
= 14x + 35
b. 4(3x - 7)
= (4 × 3x) (4 ×-7)
= 12x - 28
c. 2ab(9a + 5ab - 4b)
= (2ab × 9a) (2ab × 5ab) (2ab × -4b)
= 18a²b + 10a²b² - 8ab²