Question

x^2+x=5 решите пожалуйста

Answer 1

$x {}^{2} + x = 5 \\ x {}^{2} + x - 5 = 0 \\ d = 1{}^{2} - 4 \times ( - 5) = 1 + 20 = 21 \\ x_{1} = \frac{ - 1 - \sqrt{21} }{2} \\ x _{2} = \frac{ - 1 + \sqrt{21} }{2}$