Question

x^2-3x-1/2=x-1 срочноо ​

Answer 1

Ответ:

$frac{x^2-3x-1}{2} = x-1\\x^2-3x-1 = 2x - 2\\x^2-3x-2x - 1 + 2 = 0\\x^2 - 5x + 1 = 0\\D = 25 - 4 = 21\\x_1 = frac{5-sqrt{21}}{2} = 2,5 - 0,5sqrt{21}\\x_1 = frac{5+sqrt{21}}{2} = 2,5 + 0,5sqrt{21}$