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Greatest prime factor

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by gaggleofgirls » Sun Feb 08, 2009 8:17 pm
Because 2^34 - s^28 does not = 2^6

2^34/2^28 = 2^6

So, we need to figure out something useful to do with 2^34 - 2^28

Factor out 2^28 and you get:

2^28 (2^6-1) =
2^28 (63)

2^28 has a whole bunh of 2s as its factors, but 63 is 7 * 3 * 3,

So the greatest prime factor of 2^28(63) = 7.

Answer = D.

-Carrie
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