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For any integer a, what is(-1) × a equal to 9

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(i) For any integer a, what is(-1) × a equal to 9

(ii) Determine the integer whose product with (-1) is 5

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(i) For any integer a  (- 1) × a = -a 

ii) …………. × (-1) = 5 

∴ (-5) × (-1) = 5

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