(х+2) "в кубе" +(х-2) " в кубе"

Question

(х+2) "в кубе" +(х-2) " в кубе"

Answer 1

(x+2)³+(x-2)³= (x+2+x-2)((x+2)²-(x+2)(x-2)+(x-2)²)= 2x(x²+4x+4-x²+4+x²-4x+4)= 2x(x²-12)= 2x³-24x²