To answer this use the Sign Rules
+*+ = +
-*- = +
+* - = -
- * + = -
(-8)(-8)(5)(5)(-8)=
(-8)*(-8) = 64
(64)(5)(5)(-8)
(64)(5) =320
(320)(5)(-8)
(320)(5) = 1600
(1600)(-8) = -12800
so
(-8)(-8)(5)(5)(-8)= -12800
1.6m questions
2.0m answers