If the equation \( x^{2}+5 b x+8 c=0 \), does not have two distinct...

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If the equation \( x^{2}+5 b x+8 c=0 \), does not have two distinct real roots, then minimum value of \( 5 b+8 c \) is
\( \mathrm{P} \)
(A) 1
(B) 2
(C) \( -2 \)
(D) \( -1 \)
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