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4^17-2^28??

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by joshi.komal » Sun Oct 14, 2007 7:35 am
The simplest approach to solving such questions is to try and come to a common base. Like write 4^28 in terms of the power of 2 which is the second term then you will have much clearer picture.
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by khurram » Mon May 26, 2008 2:22 pm
finally after 30 minutes figured out how to make heads or tails.

frist make base same

2^34-2^28

divide both by 2^28.

equals 2^6-2^0

=64-1=63.

find lcm of 63 which is 7,3,1.

hence, 7 is the greatest prime factor.

Khurram
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