What is the sum of all the roots of the equation x^4 + 3x^3 - 9x^2 - 27x - 18 = 0?
Correct: A
The sum of all roots of a polynomial equation can be found using Vieta's formulas. For a polynomial equation of the form ax^n + bx^(n-1) + ... + cx + d = 0, the sum of the roots is given by -b/a. Here, a = 1 and b = 3, so the sum of the roots is -3/1 = -3.