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Need help. How do u do this? And which one would it be???

Need help. How do u do this? And which one would it be???-example-1
User Atabex
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your answer would be A

User Pranay Soni
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Divide all terms of the given poly by -4, to obtain:  b^2 + 6b + 9 = 0.  Then (b+3)^2 = 0, and b = -3.
User Raghu Nagaraju
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