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=-20x + 3y + 10y
= -20x + 13y
b. (3p+9q) -2p (8q+7)
= 3p + 9q - 16pq - 14p
=3p - 14p - 16 pq + 9q
=11p - 16pq + 9q
c. -3ab (a+2b-5) +4b (6a+3b+1)
= -3a²b - 6ab² + 15ab + 24ab + 12b² + 4ab
=-3a²b - 6ab² + 15ab + 24ab + 4ab + 12b²
= -3a²b - 6ab² + 43ab + 12b²
maaf kalo salah:-)
b. (3p + 9q) - 2p(8q + 7) = 3p + 9q - 16pq + 14p
= 17 p + 9q - 16 pq
c. -3ab(a + 2b -5) + 4b(6a+3b+1) = -3a²b -6ab² + 15ab + 24ab + 12b² + 4b
= -3ab (a + 2b + 5 + 8) + 4b ( 3b + 1)
= -3ab (a + 2b + 13) + 4b ( 3b + 1)