If the equal ratio sequence {an} is known and A4 + A8 = - 2, then the value of A6 (A2 + 2A6 + A10) is () A. 6B. 4C. 8D. -9
From the meaning of the title: A6 (A2 + 2A6 + A10) = a6a2 + 2a6a6 + a10a6, ∵ A4 + A8 = - 2, ∵ a6a2 + 2a6a6 + a10a6 = (A4 + A8) 2 = 4
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