Question

x^2+x=5 решите пожалуйста

Answer 1

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