Factor theorem.

If you have a question like

Find the remainder of

$\displaystyle x^{2}+2x-8$ when the polynomial is divided by the factor x-1

so values of x=1

so the answer is -5,

my question is, if the factor x-1 is in a bracket does it change the sign?

so would x= 1? or -1? if the factor was written as (x-1)?

thanks.