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Which expression gives the sum of roots of ax^2 + bx + c = 0?
Ab/a
B-c/a
Cc/a
D-b/a
Answer & Solution
Correct answer: D. -b/a
Comparing a(x - r1)(x - r2) with ax^2 + bx + c gives b = -a(r1 + r2), so the sum is -b/a.
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