4^17-2^28??

[joshi.komal]

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.

[khurram]

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