Verify a – (– b) = a + b for the following values of a and b.
(i) a = 21, b = 18 (ii) a = 118, b = 125
(iii) a = 75, b = 84 (iv) a = 28, b = 11
Solution:
Let, a - (- b) = a + b ---- (1)
(i) a = 21, b = 18
Put the values of a & b in equation (1)
a - (-b) = a + b
21 - (- 18) = 21 + 18
21 + 18 = 21 + 18
39 = 39
LHS = RHS. Hence verified.
(ii) a = 118, b = 125
Put the values of a & b in equation (1)
a - (- b) = a + b
118 - (-125) = 118 + 125
118 + 125 = 118 + 125
243 = 243
LHS = RHS. Hence verified.
(iii) a = 75, b = 84
Put the values of a & b in equation (1)
a - (- b) = a + b
75 - (-84) = 75 + 84
75 + 84 = 75 + 84
159 = 159
LHS = RHS. Hence verified.
(iv) a = 28, b = 11
Put the values of a & b in equation (1)
a - (-b) = a + b
28 - (-11) = 28 + 11
28 + 11 = 28 + 11
39 = 39
LHS = RHS. Hence verified.
☛ Check: NCERT Solutions for Class 7 Maths Chapter 1
Video Solution:
Verify a – (– b) = a + b for the following values of a and b. (i) a = 21, b = 18 (ii) a = 118, b = 125 (iii) a = 75, b = 84 (iv) a = 28, b = 11
NCERT Solutions Class 7 Maths Chapter 1 Exercise 1.1 Question 8
Summary:
a – (– b) = a + b for the following values of a and b has been verified (i) a = 21, b = 18 (ii) a = 118, b = 125 (iii) a = 75, b = 84 (iv) a = 28, b = 11. In all four given cases, L.H.S = R.H.S
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