X^2-6x-7=0 Можно решение?

Question

X^2-6x-7=0
Можно решение?

Answer 1

X^2 - 6x - 7 = 0 
D = 36 + 4*7 = 64
x1 = ( 6 + 8)/2 = 14/2 = 7;
x2 = ( 6 -  8)/2 = - 2/2 = - 1;