A binary operation, \(\Delta\), is defined on the set of real numbers by \(a \Delta b = a + b + 4\). Find the identity element.
- 4
- 2
- \(\frac{1}{4}\)
-
-4
The correct answer is: D
Explanation
\(a \Delta b = a + b + 4\)
\(a \Delta e = a + e + 4 = a\)
\(e = a - a - 4 = -4\)