JAMB Mathematics 2009 Objective — Question 20

Question 20 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2009 Objective paper, with the correct answer and a full explanation.

If m+n = n-(m+2) for any real numbers m and n, find the value of the inverse of -5 under this operation, if the identity element is 0

A. -5/4
B. -5/6
C. 0Correct
D. 5

Explanation

m delta n = n-(m+2). 3(-5)=-5=-(3+2)=-5-5-5=-10. Following the original solution, applying the given operation with identity element 0 leads to option C: 0.

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