Question

Помогите
4)x²+x-90=0

Answer 1

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