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(10-x)² + (10 + x)²=208
100-20x+x²+ 100+ 20x + x²=208
200 + 2x²=208
2x²=8
x²=4
x=2
10-2=8
10+2=12
100-10x-10x+x²+100+10x+10x+x²=208
200-20x+2x²+20x=208
200+2x²=208
2x²=208-200
2x²=8/2
x=√4
x=2
sprawdzamy 8+12=20
64+144=208