121+9=130 are both even squares and when added together it equals 130 I found this just by writing down a ton of numbers that are square numbers,
4,9,16,25,36,49,64,81,100,121,144 and then experimenting with different numbers, and 121+9=130 and 130=130 checks out to be true, and that's it!=)
Hope this helps!=)
