Question

Решите уравнение x^2-(3-x)=21

Answer 1

$x^2-(3-x)=21$
$x^2-3+x-21 = 0$
$x^2+x-24 = 0$
$D = 1-4*(-24) = 1+96 = 97$
$x_{1} = \frac{-1+\sqrt{97}}{2}$
$x_{2} = \frac{-1-\sqrt{97}}{2}$