a3 + b3 + c3 = 3abc if _____.

a = b = c a + b + c = 0 a + b + c = 1 a + b + c = -1

a + b + c = 0

a3 + b3 + c3 = 3abc Take a = b = c 13 + 13 +13 = 3 × 1 × 1 × 1 3 = 3 So , a3 + b3 + c3 = 3abc , when a = b = c