If (A-8) 2 + 3 has a minimum, then 5a-40=______ ．

∵ (A-8) 2 + 3 has the minimum value, ∵ (A-8) 2 is the minimum. When a = 8, the original formula takes the minimum value, and when a = 8, 5a-40 = 5 × 8-40 = 0

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