thanks tiger, but the question now is changed to : is 6^15 > 7^4 + 9^3 ?it is tough for me too
Thats much easier: Its true that 6^15 > 7^4 + 9^3 because 6^15 is way larger than (7^4 + 9^3).
It is always true that n^(n+1) > (n+1)^n for all n>2.
Moreover, the issue here is not of addition rather multiplication. In that case, 6^15 is way greater than (7^4 * 9^3).
Therefore, 6^15 is undoubtdly even greater than (7^4 + 9^3).