Pls explain me the below question fast

-64/125
Now -64 can Be written as -4 x -4 x -4 or (-4)³
Now 125 Can Be written As 5 x 5 x 5 or 5³
So ,  
-64/125 = (-4)³ / 5³    (Using Property   a^m/b^m = (a/b)^m)
= (-4/5)³