2^x + 2^x+1 + 2^x+2= 896. What is the value of x?

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• A 6
• B 7
• C 3
• D 8

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Answer: B. 7

2^x + (2^x x 2^1) + (2^x x 2^2)= 896. 2^x x ( 1+2+4)=896 2^x x 7 = 896 2^x=128 x=7

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