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a + b = n(3)
ab = n(5)
Karena a dan b bilangan bulat positif, diuji coba :
n = 1,2,3,4,5,6,.....
Ternyata n yang memenuhi adalah n = 4, maka :
a + b = 4.3 = 12
ab = 4.5 = 20
Sehingga a = 10 ; b = 2
Maka :
a² + b² = 10² + 2² = 100 + 4 = 104