Question

$x^{2} -5x-7=0$            

Answer 1

$x^{2} -5x-7=0 \ x_1= frac{5+ sqrt{(-5)^2-4*(-7)} }{2} = frac{5+ sqrt{53} }{2} \ x_2= frac{5- sqrt{(-5)^2-4*(-7)} }{2} = frac{5- sqrt{53} }{2}$