Question 256541
(-1)^1,(-1)^2,(-1)^3,(-1)^4,(-1)^5
-1, 1, -1, 1, -1
ALL EVEN POWERS RESULT IN A POSITIVE NUMBER.
ALL ODD POWERS RESULT IN AN ODD NUMBER.
THEREFORE (-1)^19=-1 BECAUSE 19 IS AN ODD POWER.