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b. (6a - 5b - 2c) + (-8a + 6b + 9c)
= 6a - 8a - 5b + 6b - 2c + 9c = -2a + b + 7c
c. (5p(4p-3)) + (7p(3p+4))
= 20p² - 15p + 21p² + 28p = 20p² + 21p² - 15p + 28p = 41p² + 13p
d. (4x(2x²-3x+5)) + (3x(4x²+9x-8))
= 8x³ - 12x² + 20x + 12x³ + 27x² - 24x
= 8x³ + 12x³ - 12x² + 27x² + 20x - 24x = 20x³ + 15x² - 4x