[" 4.Roots of the equation "x^(2)+bx+45=...

[" 4.Roots of the equation "x^(2)+bx+45=0,b in R" lies on the curve "|z+1|=2sqrt(10)" ,where "z],[" is a complex number,then "],[[" a."b^(2)+b=12," b."b^(2)-b=36],[" c."b^(2)-b=30," d."b^(2)+b=30]]

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