A binary operation * is defined on the set of real numbers R, by a*
FURTHER MATHEMATICS
WAEC 2011
A binary operation * is defined on the set of real numbers R, by a* b = -1. Find the identity element under the operation *.
- A. -1
- B. 0
- C. 1
- D. 2
Correct Answer: A. -1
Explanation
\(a * a^{-1} = e = -1\)
\(\therefore a^{-1} = -1\)
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