2001
Mathematics
JAMB
An operation * is defined on the set of real numbers by a*b = a + b + 1. If the identity elements is -1, find the inverse of the element 2 under *.
A.
4
B.
0
C.
-2
D.
-4
Correct Answer: -4
Explanation
By definition a*b = a + b + 1. Let the inverse of the element 2 be x, Therefore 2*x = -1 i.e. 2 + x + 1 = -1 3 + x = -1 x = -1 - 3 x = -4
By definition a*b = a + b + 1. Let the inverse of the element 2 be x, Therefore 2*x = -1 i.e. 2 + x + 1 = -1 3 + x = -1 x = -1 - 3 x = -4THIS WEEK's
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