Question

квадратное уравнение х^2-7х-1=0

Answer 1

$x^{2}-7x-1=0\\\\D=(-7)^{2}-4*(-1)=49+4=53\\\\x_{1}= \frac{7-\sqrt{53}} {2}\\\\x_{2}= \frac{7+\sqrt{53}} {2}$