What is the sum of the roots of x^2 - 5x + 6 = 0?

• A. -5
• B. 5
• C. 6
• D. 1

Answer: (B)

For a quadratic written as ax^2 + bx + c = 0, the two roots add up to minus the coefficient of x divided by the coefficient of x^2. Here, a = 1 and b = -5, so the sum of the roots is -(-5)/1 = 5. You can also see this by factoring: (x - 2)(x - 3) = 0 gives roots 2 and 3, which add to 5.