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a+b = 6
ab = 4
Ingat bahwa
(a+b)² = a² + b² + 2ab
Jadi
a² + b² = (a+b)² - 2ab
= (6)² - 2. 4
= 36 - 8
= 28
Jadi jumlah kuadrat bilangan" itu adalah 28.