The expanded form of the expression; (-a)^3 is; (-a)(-a)(-a).
It follows from the task content that the expanded form of the expression given is to be written.
On this note, the expression (-a)³ can simply be rewritten in it's expanded form as; (-a)(-a)(-a).
Read more on expanded form;
https://brainly.com/question/29114
#SPJ1