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b) - 4p(2p - 5q) + 8p²
= - 8p² + 20pq + 8p²
= 20pq
c) - 5(2p - 3) + 7p
= - 10p + 15 + 7p
= - 3p + 15
d) 4 - (4 - 5b) = 4 - 4 + 5b = 5b
yang D = 4-(4-5b) = 4-4-5b= -5b