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Verify a – (– b) = a + b for the following values of a and b. (i) a = 21, b = 18 (iii) a = 75, b = 84 (ii) a = 118, b = 125 (iv) a = 28, b = 11

8. 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

Answers (1)
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(i)     a = 21, b = 18

L.H.S = a-(-b) = 21-(-18)

= 21+18 = 39

R.H.S = a+b= 21+18 = 39

\therefore L.H.S = R.H.S

Hence verified.

(ii)     a = 118, b = 125

L.H.S = a-(-b) = 118-(-125)

= 118+125 = 243

R.H.S = a+b= 118+125 = 243

\therefore L.H.S = R.H.S

Hence verified.

(iii)     a = 75, b = 84

L.H.S = a-(-b) = 75-(-84)

= 75+84 = 159

R.H.S = a+b= 75+84 = 159

\therefore L.H.S = R.H.S

Hence verified.

(iv)    a = 28, b = 11

L.H.S = a-(-b) = 28-(-11)

= 28+11 = 39

R.H.S = a+b= 28+11 = 39

\therefore L.H.S = R.H.S

Hence verified.

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