(х+6) (Х^2-6х+36) - 2(х-3) (х+3)

Question

(х+6) (Х^2-6х+36) - 2(х-3) (х+3)

Answer 1

 

(х+6) (Х^2-6х+36) - 2(х-3) (х+3)=x³+216-2x²+18=x³-2x²+234