Alan W. answered 01/08/21
Effective Math Tutor Specializing in Algebra and Pre-Algebra
A quick way to solve this would be to square the numbers in your solution set to see which one matches. So, let's try that.
8 x 8 = 64
10 x 10 = 100
13 x 13 = 169
17 x 17 = 289
So it looks like 13 is your solution because 13 squared is 169 and that is in your set of perfect square numbers.
I hope this helps. Contact me if you have any questions.