2²+5² = 2·2+5·5 = 4+25 = 29
9²-2² = 9·9-2·2 = 81-4 = 77
6²-30 = 6·6-30 = 36-30 = 6
9²+3² = 9·9+3·3 = 81+9 = 90
4²+10 = 4·4+10 = 16+10 = 26
4²-13 = 4·4-13 = 16-13 = 3
2²+5² = 2·2+5·5 = 4+25 = 29
9²-2² = 9·9-2·2 = 81-4 = 77
6²-30 = 6·6-30 = 36-30 = 6
9²+3² = 9·9+3·3 = 81+9 = 90
4²+10 = 4·4+10 = 16+10 = 26
4²-13 = 4·4-13 = 16-13 = 3