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Complex Numbers question

2020 · 8 Jan · Shift 1 · Q35

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PYQ Library
JEE Main
Mathematics
Complex Numbers
2020 · 8 Jan · Shift 1 · Q35

Complex Numbers question

2020 · 8 Jan · Shift 1 · Q35

JEE MainMathematicsComplex NumbersMCQ+4 / −1

If the equation, x2 + bx + 45 = 0 (b

\in

R) has conjugate complex roots and they satisfy |z +1| = 2

\sqrt {10}

, then :

A
b2 – b = 42
B
b2 + b = 12
C
b2 + b = 72
D
b2 – b = 30

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