Question

x(x+12)=85
x(x-2)=63
Помогите 20 балл
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Answer 1

x² - 2x - 63 = 0

D = b² - 4ac = 4 - 4 × (-63) = 4 + 252 = 256 = 16²

x1 = ( 2 + 16) / 2 = 9

x2 = ( 2 - 16) / 2 = - 7

Ответ: x1 = 9, x2 = - 7

x² + 12x - 85 = 0

D = b² - 4ac = 144 - 4 × ( - 85) = 144 + 340 = 484 = 22²

x1 = ( - 12 + 22) / 2 = 5

x2 = ( - 12 - 22) / 2 = - 17

Ответ: x1 = 5, x2 = - 17