ok help.. this might sound super easy... but i cant seem to get it... i thought the answer was 1 but my teacher said it was wrong...

2^29 - 2^28

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2

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- Sep 11th 2006, 06:07 PMeah1010this might be simple... but i dont know
ok help.. this might sound super easy... but i cant seem to get it... i thought the answer was 1 but my teacher said it was wrong...

2^29 - 2^28

__________

2 - Sep 11th 2006, 06:13 PMQuick
- Sep 11th 2006, 06:16 PMJameson
Well try testing smaller numbers to see why you can't just subtract.

Let's try 2^3-2^2. Expanding out both terms gives you 8-4=4. Now let's factor this to see if that can make some sense. 2^3-2^2=2^2(2-1)=2(1)=2

Apply this same technique to your problem.

2^29-2^28=2^28(2-1)=2^28(1)=2^28

And divide by two. So (2^28)/2=2^27 - Sep 11th 2006, 06:22 PMeah1010
thank you so much! you guys rock!