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13²=a² + b² 169=(17-b)²+b² 169 = 17²-34b+b²+b²
2b²-34b+289-169=0 2b²-34b+120=0 b²-17b+60=0
(b-12)*(b-5)= 0 b-12=0 b=12 b-5=0 b=5
a=17-b a= 17-12 a=5 a=17-5 a=12
si a = 5 entonces b=12
si a=12 entonces b=5