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A binary operation on the real set of numbers excluding -1 is such that for...

Mathematics
JAMB 2008
A binary operation on the real set of numbers excluding -1 is such that for all m, n ∈ R, mΔn = m+n+mn. Find the identity element of the operation.
  • A. 1
  • B. zero
  • C. -1/2
  • D. -1
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Correct Answer: Option B
Explanation
mΔn = m+n+mn
Let e be the identity element
∴mΔe = eΔm = m
m+e+me = m
e+me = m-m
e+me = 0
e(1+m) = 0
e = 0 / (1+m)
e = 0

There is an explanation video available below.

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Explanation Video

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