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a + b = 6
a x b = 4 atau ab = 4
ditanya a2 + b2 = ...
jawaban
a2 + b2
= a2 + 2ab + b2
= a2 + b2 + 2ab
= (a + b)2 + 2ab
= 6 kuadrat + 2x4
= 36 + 8
= 44