Question

Let * be a binary operation on the set I of integers, defined by a * b = 2a + b − 3. Find the value of 3 * 4.

Answer 1

Given: a * b = 2a + b − 3   
 3 * 4 = 2 (3) + 4 \[-\] 3

          = 6 + 4 \[-\] 3

           = 7