Решите уравнение X2+1-x-3=0

Question

Решите уравнение X2+1-x-3=0

Answer 1

Х^2 - x - 2 = 0
D = 1 -4*(- 2) = 1 + 8 = 9;    √D = 3
x1 = ( 1 + 3) / 2 = 2
x2 = (1 - 3) /2 = - 1