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x2=7(k+1)+2
x1^2+x2^2=1429
(7k+2)²+(7k+9)²=1429
49k²+28k+4+49k²+14*9k+81-1429=0
98k²+154k-1344=0
14k²+22k-192=0
7k²+11k-96=0
Δ=121+28*96=2809
k1=(-11+53)/14=42/14=3
k2<0
Szukane liczby to:
x1=7*3+2=23
x2=7*4+2=30