Ответы на вопрос:
X^2 + 9x - 7 = 0 d = 81 + 28 = 109 x1 = ( - 9 + √109)/2; x2 = ( - 9 - √109)/2 x1 + x2 = ( - 9 + √109)/2 + ( - 9 - √109)/2 = - 18/2 = - 9 x1*x2 = ( - 9 + √109)/2 *( - 9 - √109)/2 = - 7
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