Mathematics

# Multiply and simplify. (a - 2b) (2a - b) (a + 2b)

$(a - 2b) (2a - b) (a + 2b)=\\ (2a-b)(a^2-4b^2)=\\ 2a^3-8ab^2-a^2b+4b^3=\\ 2a^3-a^2b-8ab^2+4b^3$