Question

Решите уравнение х²+9х+18=0

Answer 1

x^2 + 9x+  18 = 0 
D = 81 - 72 = 9 = 3^2
x1 = ( - 9 + 3)/2 = - 6/2 = - 3;
x2 = ( - 9 - 3)/2 = - 12/2 = - 6 

Answer 2

Большое спасибо))