Verify a-(-b) = a+b for the following values of and a : b (i) a=21,b=18 (ii) a=118,b=125

(i) a=21,b=18
Given: a=21,b=18
We have a-(-b) = a + b
Putting the values in L.H.S. = a-(-b)= 21-(-18) = 21+18 =39
Putting the values in R.H.S. = a + b = 21 + 19 = 39
Since, L.H.S. = R.H.S
Hence, verified.

(ii) Given: a = 118,b = 125
We have a-(-b)=a+b
Putting the values in L.H.S. = a-(-b) = 118 = (-125) = 118+125 =243
Putting the values in R.H.S. = a+b = 118 + 125 = 243
Since, L.H.S. = R.H.S
Hence, verified.

7 Maths Chapter 1 Exercise 1.1 Question 7, 8

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