Question

Помогите!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!11

Answer 1

-x^2 - 10x - 18 = 0 
x^2 + 10x + 18 = 0 
D = 100 - 4*18 = 100 - 72 =  28

x =  $frac{-b +- sqrt{28} }{2}$