MathematicsBinary operationsJAMB
The operation * on real numbers is defined by a * b = a + b + 2, with identity element −2. Find the inverse of 3.
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Answer: D. −7
3 * x = −2 gives 3 + x + 2 = −2, so x = −7.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.