Question

Помогите
4)x²+x-90=0

Answer 1

$x^{2}+x-90=0\\\\D=1^{2}-4*(-90)=1+360=361=19^{2} \\\\x_{1} =\frac{-1-19}{2} =-\frac{20}{2}=-10\\\\x_{2}=\frac{-1+19}{2}=\frac{18}{2} =9\\\\Otvet:\boxed{-10;9}$