SOLUTION: The quadratic equation x²+bx+9=0 has a unique solution if b= -6 or if b=___?

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Question 1172676: The quadratic equation x²+bx+9=0 has a unique solution if b= -6 or if b=___?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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. . . or if b= 6    (due to the similar reason as for b= -6).