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a²+a²=364
a⁴=364
a²=2√91
a=√2√91
x+1 = kolejna liczba
x²+(x+1)²=365
x²+x²+2x+1=365
2x²+2x-364=0 /:2
x²+x-182=0
a=1, b=1, c=-182
Δ=b²-4ac=1-4*1*(-182)=1+728=729
√Δ=27
x₁=(-b+√Δ)/2a=(-1+27)/2=26/2=13
x₂=(-b-√Δ)/2a=(-1-27)/2=-28/2=-14 ---> nie jest liczbą naturalną
szukane liczby to 13 i 14
spr. 13²+14²=169+196=365