Perforum subtraction on given unsigned binary numbers using 2\'scompliment of su

Question

Perforum subtraction on given unsigned binary numbers using 2'scompliment of subtrahend. Where the result should be negative, fineits 2's complement and affix a minus sign

1) 1001-101000
2) 110000-101000

Also, this is in same question 100010-100011. Why is that this usessign extension but 10011-10001 does not? I have the answers to bothof these which both are under this question I presented but I can'tunderstand why sign extension is used on one and not the other.Same with problem 1 and 2. Problem 2 shows sign extension beingused.

Explanation / Answer

1) 1001 - 101000    0 0 1 0 01                                 00 1 0 0 1 - 1 0 1 0 0 0      2'scomplement    0 1 1 0 0 0 -------------                                ----------------                                        Add       10 0 0 01                  Theanswer is in 2's complement                   Take2's complement   0 1 1 1 1 1 Answer is - 0 1 1 1 1 1                                                     2) 110000 - 101000    1 1 0 0 00                                  11 0 0 0 0 - 1 0 1 0 0 0      2'scomplement     0 1 1 0 0 0 ---------------                              --------------                                          Add    10 0 1 0 0 0                                                     |                                                     |                                           Neglectthe  End Around Carry    Answer is 0 0 1 0 0 0    

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