Question

show that square of any positive integer cannot be of the form 5q or 5q+2

Answer 1

let give a positive integers 1,2,3,4,5,6
5q+1 odd
5q+2. even
5q+3. odd
5q+4 even
5q+5. odd
5q+6 even
than 5q+2 is a positive integers

Answer 2

Answer:

I have given you answer in the pic