Question

$x^{2} =2x-1$
напишите решение

Answer 1

x^2 = 2x - 1
x^2 - 2x + 1 = 0
a = 1, b = -2, c = 1
D = b^2 - 4ac = 4 - 4*1*1 = 0.
=> есть 1 корень

x1 = (-b + D) / 2a = (2+0)/2*1 = 1