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A + B = 6
A..B = 4
ditanya : A² + B²
A² + B² = (A + B)² - 2.A.B
= (6)² - 2. 4
= 36 - 8
= 24
bil kedua = b
a+b = 6
a*b = 4
a² + b² = (a+b)² - 2a*b
a² + b² = 6² - 2*4
a² + b² = 36 - 8 = 28