If 2^x + 2^x + 2^x + 2^x = 2^10, find the value of x.

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• A 2.5
• B 5
• C 8
• D 3

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Answer: C. 8

2^x + 2^x + 2^x + 2^x = 4 × 2^x = 2² × 2^x = 2^(x + 2).
So 2^(x + 2) = 2^10, which gives x + 2 = 10 and x = 8.

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