Just square both sides..
and to find the range
just put the values -7 and 1 on a number line
take out any value less than 1 like 0 and put it into (x-1)(x+7)
take out another value between -7 and 1 and put it into ^
and finally a value less than -7 and put it into (x-1)(x+7)
and see if they are less than 0