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Verify the following:

(a) 18 x [7 + (–3)] = [18 x 7] + [18 x (–3)]

(b) (–21) x [(–4) + (–6)] = [(–21) x (-4)] + [(–21) x (–6)]

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(a) 18 x [7 + (–3)] = [18 x 7] + [18 x (–3)] 

⇒ 18 x 4 = 126 + (–54) 

⇒ 72 = 72 

⇒ L.H.S. = R.H.S. Hence verified.

(b)(–21) x [(–4) + (–6)] = [(–21) x (–4)] + [(–21) x (–6)] 

⇒ (–21) x (–10) = 84 + 126 

⇒ 210 = 210 

⇒ L.H.S. = R.H.S. Hence verified.

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