Verifikasi a – (– b) = a + b untuk nilai a dan b berikut.(i) a = 21, b = 18 (ii) a = 118, b = 125 (iii) a = 75, b = 84 (iv) a = 28, b = 11

Penyelesaian:

(i) a = 21, b = 18

a – (-b) = 21-(-18)

21-(-18) = 21 + 18

21+18= 39

a + b = 21+18

21+18 = 39

21-(-18) = 21+18 = 39

a – (-b) = 118 – (- 125)

118- (- 125) = 118 + 125 = 243

a + b = 118 + 125

118 + 125 = 243

118 – (- 125) = 118 + 125 = 243

a – (-b) = 75 – (- 84)

75 – (- 84) = 75 + 84 =159

a + b = 75 + 84

75 + 84 = 159

75 – (- 84) = 75 + 84 =159

a – (-b) = 28 – (-11)

28 – (-11) = 28 + 11 = 39

a + b = 28 + 11 = 39

28 +11= 39

28 – (-11) = 28 +11= 39