Question

add binary eqivalent of (-9) to (-8) in 2's compliment method​

Answer 1

First, you convert the magnitude of the number to binary, and pad to the word size (8 bits). If the original number was positive, you are done. Otherwise, you must negate the binary number by inverting the bits and adding 1. Convert -72 to an 8-bit, twos complement binary number.