If the equation x^ 2 +b x+45=0(b R) has conjugate complex roots and they satisfy |z+1|=2…
Mathematics · JEE Main · NTA Exams — Complex Numbers and Quadratic Equations
If the equation \(x^{2}+b x+45=0(b \in R)\) has conjugate complex roots and they satisfy \(|z+1|=2 \sqrt{10}\), then:
- \(b^{2}-b=30\)
- \(b^{2}+b=72\)
- \(b^{2}-b=42\)
- \(b^{2}+b=12\)
Answer
(A) b^ 2 -b=30
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