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xpatrat - 3x + 5 = 15

Răspuns :

x^2 - 3x + 5 = 15
x^2 - 3x + 5 -15 = 0
x^2 - 3x - 10 = 0

Delta = 9 + 4x10 = 49
x1 = (3 + rad 49)/2 = (3+7)/2 = 5
x2 = (3 - rad 49)/2 = (3-7)/2 = -4/2 = -2


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