Why -1-1 equals 1?

Answer 1

-1*-1

(-2+1)(-2+1)

-2*-2+1*-2+1*-2+1*1

since multiplication is repeated addition

then

-1*-1*4+(-2)+(-2)+(1)

let -1*-1=x

-1*-1=-1*-1*4-2-2+1

x=x*4-4+1

x=4x-3

3=4x-x

3=3x

3/3=x

1=x

thus -1*-1=x=1