Решите уравнение х^2-х-6=0

Question

Решите уравнение х^2-х-6=0

Answer 1

X^2 - x - 6 = 0 
D = 1 + 4*6 = 25
x1 = ( 1 + 5)/2 = 6/2 = 3;
x2 = ( 1 -  5)/2 = - 4/2 = - 2;

Answer 2

X^2-x-6=0
x1+x2=1
x1*x2=-6
x1=3
x2=-2