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b) (2x - 2) (x + 5) = 2x² + 10x - 2x - 10
= 2x² + 8x - 10
c) (x - 5) (x² - 4x + 20) = x³ - 4x² + 20x - 5x² + 20x - 100
= x³ - 4x² - 5x² + 20x + 20x - 100
= x³ - 9x² + 40x - 100