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From module Quadratic Formula and Discriminant
The real numbers c,b,ac,b,ac,b,a form an arithmetic sequence with a≥b≥c≥0a \geq b \geq c \geq 0a≥b≥c≥0. The quadratic ax2+bx+cax^2 + bx + cax2+bx+c has exactly one root. What is this root?
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