( -4 ) 3

(----)
( 5 )

if you can't read that, negative 4, fifths, squared. -4/5 in parentheses.

Use the law of exponents that says:

(a/b)^m
=a^m/b^m

So for example:
(2/3)³
=2&sup3 / 3³
=8/27