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Rom4ik96RUS
@Rom4ik96RUS
July 2022
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Помогите решить квадратные уравнения
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krugly1981
X² + 5x = 0
x( x +5) = 0
x = 0
x + 5 = 0
x = - 5
2x² + x + 67 = 0
D = b² - 4ac = 1 - 4×2 ×67 = 1 - 536 = - 535 - Dотрицат,значит,корней нет
8a² - 14a + 5 =0
D = b² - 4ac = 196 - 4×8×5 = 196 - 160 = 36 = 6²
x1 = ( 14 + 6) / 16 = 1,25
x2 = ( 14 - 6) / 16 = 0,5
4x² + 9 =0
D = b² - 4ac = 0² - 4 ×4×9 = - 144 - дискриминант отрицательный,значит,корней нет
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Answers & Comments
x( x +5) = 0
x = 0
x + 5 = 0
x = - 5
2x² + x + 67 = 0
D = b² - 4ac = 1 - 4×2 ×67 = 1 - 536 = - 535 - Dотрицат,значит,корней нет
8a² - 14a + 5 =0
D = b² - 4ac = 196 - 4×8×5 = 196 - 160 = 36 = 6²
x1 = ( 14 + 6) / 16 = 1,25
x2 = ( 14 - 6) / 16 = 0,5
4x² + 9 =0
D = b² - 4ac = 0² - 4 ×4×9 = - 144 - дискриминант отрицательный,значит,корней нет