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x = 2-√2 v x = 2+√2
x^2 - 4x + 2 = 0
jika akar2nya 5 kurangnya kan bisa dituliskan dengan bentuk -5, maka:
x^2 - 4(-5)x + 2(-5)^2 = 0
x^2 + 20x + 2(25) =0
x^2 + 20x + 50 = 0