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a) 18x + 5x - 14x = 9x
b) 24a²bc² : 8abc = (24 : 3) × a²⁻¹ × b¹⁻¹ × c²⁻¹
= 3ac
c) (3x - 4)² = 1(3x)² - 2(3x)(4) + 4²
= 9x² - 24x + 16
d) 4(x + 2y) - 5(x - 4y) = 4x + 8y - 5x + 20y
= -x + 28y