Question

. Verify a -(-b)=a+b for the value of a and b.
i. a=21, b=18
a= -11, b= -12
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Answer 1

Answer: 39 and -23 respectively

Step-by-step explanation:

a -(-b) = a+b

21 -(-18) =21+18

21+ 18 = 21+18

39=39

Hence proved

Likewise you can do the other question also. The only thing is minus into minus is equal to plus

For example :

-(-1)= +1

Answer 2

Answer:

21-(-18)=21+18

21+18=39

-11-{-(-12)}=-11+(-12)

-11-12=-23