|x-1|
=> x-1=-8
x=-7 => -7
Similarly for |y|
we need to determine the range of XY, right?we need to find maximum and minimum product of Xy
Minimum of XY can be found multiplying 3*(-7) from the range of X and Y,which is -21
Maximum of Xy is 9*3=27
therefore, the range is -21