SubArea: Powers and roots of complex numbersLevel: BProject ID: 1003109301Source Problem: 2010013401Accepted: 1Clonable: 1Easy: 0Consider the equation \( x^4 + 81 = 0 \). Find the sum of all its roots in the set of complex numbers.\( 0 \)\( 3 \)\( -3 \)\( 81 \)\( - 81 \)
