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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.

Posted by

HARSH KANKARIA

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