theroots of theequation \( x^{2}+a^{2}=8 x+6 a \) are real, then a belongs to the interval (A) \...

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theroots of theequation \( x^{2}+a^{2}=8 x+6 a \) are real, then a belongs to the interval
(A) \( (2,8] \)
(B) \( [-2,8] \)
(C) \( [-8,2] \)
(D) none of these
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