Question

Verify a – (– b) = a + b for the following values of a and b.(i) a = 21, b = 11(ii) a = 118, b = 125(iii) a = 75, b = 84 (iv) a = 28, b = 11NCERT Class 7th Mathematics Chapter 1 Integers

Answer 1

1.LHS=a-(-b)
          =21-(-11)
           =21+11
          =32
RHS=a+b
       =21+11
       =32
∴LHS=RHS

2.LHS=a-(-b)
          =118-(-125)
          =118+125
          =   243
RHS=a+b
       =118+125
      =243
∴LHS=RHS

3.LHS=a-(-b)
         =75-(-84)
         =75+84
        =159
RHS=a+b
       =75+84
       =159

4.LHS=a-(-b)
          =28-(-11)
          =28+11
            =39
RHS=a+b
      =28+11
      =39
∴LHS=RHS

Answer 2

Hi friends.

1). a = 21 b = 11
a-(-b)=a+b
21-(-11) = 21 + 11
21+11=21+11
32=32

2). a=118 b= 125
118-(-125)=118+125
118+125=118+125
243=243.

3).a=75 b=84.
75+84= 75+84
159= 159

4). a=28 b= 11.
28+ 11 = 28+11
39 = 39


thank you