Further MathematicsSets, binary operations and logicWAEC
The operation a * b = a + b + 3 on the real numbers has identity element −3. Find the inverse of 2.
Show answer
Answer: C. −8
2 * b = −3 gives 2 + b + 3 = −3, so b = −8.
An AdmitMe practice question, written for the WAEC syllabus. Not an official past question.