A binary operation, \(\Delta\), is defined on the set of real numbers by \(a \Delta b = a + b + 4\). Find the identity element.

A.

4

B.

2

C.

\(\frac{1}{4}\)

D.

-4

View answer & explanation

Correct answer is D

\(a \Delta b = a + b + 4\)

\(a \Delta e = a + e + 4 = a\)

\(e = a - a - 4 = -4\)

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