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Math Question - Subtracting or Adding Exponents with same base


gwe9766

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Example comparison question:

 

Column A: (2^30 - 2^29)/2

 

Column B: 2^28

 

The answer is C. Can someone please explain why these 2 columns are the same? Also any insight on adding or subtracting exponents with the same base would be useful.

 

Thanks!

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