|x^2-6x-1|<6

What I did was:

-6<x^2-6x-1<6

-6<x^2-6x-1

-5<x^2-6x

-x^2+6x-5<0

(x-5)(x-1)

x=5, x=1

1<x<5

x^2-6x-1<6

x^2-6x-7<0

(x-7)(x+1)<0

-1<x<7

The answer given is -1<x<1 or 5<x<7

Do I have to sketch a graph to visualize it or something to understand it better?