(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