Please awnser and make sure it is right I will brainlist

Answer:
x³-9x²+27x-27
Step-by-step explanation:
(x-3)³
EXPAND
x³-3x²×3+3x×3² -3³
COMBINE
x³-9x²+3x×9-27
multiply 3x ×9
x³-9x²+27x-27