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veemveemveem
@veemveemveem
August 2022
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Решите уравнение 2x^2=4x+30 ДАЮ 20 БАЛЛОВ
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shoshoshosho
2x^2=4x+30
2x^2 - 4x - 30 =0 |:2 (сокращаем на 2)
x^2 - 2x - 15 = 0
a = 1, b = - 2, c= -15
D = b^2 - 4ac = (-2)^2 - 4*1*(-15) = 4 + 60 =64=8^2 > 0 - два корня
x1 = -b - корень D/2a = -(-2) - 8/2*1= 2-8/2= -6/2 = -3
x2 = -b + корень D/2а = -(-2) + 8/2*1 = 2+8/2 =
10/2 = 5
Ответ: - 3; 5
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Answers & Comments
2x^2 - 4x - 30 =0 |:2 (сокращаем на 2)
x^2 - 2x - 15 = 0
a = 1, b = - 2, c= -15
D = b^2 - 4ac = (-2)^2 - 4*1*(-15) = 4 + 60 =64=8^2 > 0 - два корня
x1 = -b - корень D/2a = -(-2) - 8/2*1= 2-8/2= -6/2 = -3
x2 = -b + корень D/2а = -(-2) + 8/2*1 = 2+8/2 =
10/2 = 5
Ответ: - 3; 5