36 - The sequence is deducting two from the difference between the two numbers each time.
81-64=17
64-49=15 therefore
49-36=13
It is squire of numbers in decending order
9*9=81
8*8=64
7*7=49
6*6=36
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81
The next number will be 25 because 5 times 5 = 25
The given number sequence is a series of perfect squares: 7^2, 8^2, 9^2, 10^2. Therefore, the next number in the sequence would be 11^2, which is 121.
49 equals 72, and the next square number is 82 = 64.
25, 36, 49, 64, 81, 100...