If the quadratic equation ax^2 + bx + c = 0 has roots r1 and r2, which of the following is true?

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A. r1 + r2 = -b/a

B. r1 * r2 = -c/a

C. r1 + r2 = c/a

D. r1 * r2 = b/a

E. None of the above

Answer: A. r1 + r2 = -b/a

According to Vieta's formulas, the sum of the roots r1 and r2 is equal to -b/a.

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