2x^2-3x-5=0 2x^2-3x-2=0. 2x^2+5x-3=0

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Алгебра

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6 февраля, 23:13

2x^2-3x-5=0 2x^2-3x-2=0. 2x^2+5x-3=0

+3

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Поля · Answer 1

2x² - 3x - 5 = 0

D = 9 + 5•2•4 = 49 = 7²

x1 = (3 + 7) / 4 = 2,5

x2 = (3 - 7) / 4 = - 1

2x² - 3x - 2 = 0

D = 9 + 2•2•4 = 25 = 5²

x1 = (3 + 5) / 4 = 2

x2 = (3 - 5) / 4 = - 1/2

2x² + 5x - 3 = 0

D = 25 + 3•2•4 = 49 = 7²

x1 = (-5 + 7) / 4 = 1/2

x2 = (-5 - 7) / 4 = - 3.