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Roots of the equation x^2 + bx + 45 = 0,...

Roots of the equation `x^2 + bx + 45 = 0`, `b in R` lie on the curve `|z + 1| = 2sqrt(10) , where z is a complex number then

A

` b^(2) + b = 12 `

B

` b^(2) +b =72`

C

` b^(2) -b =30`

D

` b^(2) -b =42`

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The correct Answer is:
c
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