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Ответ

Ответ дан
alphabet26102405

Ответ:

x1 = 20, x2 = -10

Объяснение:

Приводим к общему знаменателю:

40*(х+10) = 40х + 2х(х+10)

40х+400 = 40х+2х^2+20x

2x^2 - 20 x - 400 = 0

Поделим уравнение на 2:

x^2 - 10x - 200 = 0

D = b^2-4ac

D = 10^2 - 4*1*(-200) = 100 + 800 = 900

sqrt{D} = sqrt{900}  = 30

x1 = (-b+sqrt{D})/2a = (10+30)/2 = 40/2 = 20

x1 = (-b-sqrt{D})/2a = (10-30)/2 = -20/2 = -10

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