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MATHEMATICS

JAMB 2009 - Question 21

Mathematics 2009 JAMB Past Questions - Question 21: A binary operation * defined on the set of integer is such that m*n=m+n+mn for all integer m and n .Find the inverse of -5 under this operation,if the identity element is 0.

A binary operation * defined on the set of integer is such that m*n=m+n+mn for all integer m and n .Find the inverse of -5 under this operation,if the identity element is 0.

A: -5/4

B: -5/6

C: 0

D: 5

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Correct Answer

Explanation

inverse of - 5 = - (-5) = + 5 = 5