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Verify the following:

(a)

(b)

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Learn Exercise 1.3

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(a) L.H.S. = 18 × = 18 × = 18 × 4 = 72 R.H.S. = + = 126 + (− 54) = 72 Hence, (b) L.H.S. = (−21) × = (−21) × = (−21) × = 210 R.H.S. = + = 84 + 126 = 210 Hence,
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(a) L.H.S. = 18 × [7 + (− 3)] = 18 × [7 − 3] = 18 × 4 = 72

R.H.S. = [18 × 7] + [18 × (− 3)] = 126 + (− 54) = 72

Hence,

(b) L.H.S. = (−21) × [(−4) + (−6)] = (−21) × [− 4 − 6] = (−21) × [−10] = 210

R.H.S. = [(−21) × (−4)] + [(−21) × (−6)] = 84 + 126 = 210

Hence,

 

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