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Question
Find the product, using suitable properties:
(− 57) × (− 19) + 57
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Solution
(−57) × (−19) + 57
= 57 × 19 + 57 × 1
= 57 [19 + 1] (a × b) + (a × c) = a × (b + c)
= 57 × 20 = 1140
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