JAMB Mathematics questions: Binary operations

22 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Binary operations· JAMB

   The operation ∘ is defined by a ∘ b = a² + 2b. Find x if x ∘ 3 = 22.

   • A4 only
   • B±4
   • C±16
   • D8

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   Explanation and discussion

2. Question 22· Binary operations· JAMB

   The operation * on real numbers is defined by a * b = a + b + 2, with identity element −2. Find the inverse of 3.

   • A7
   • B−5
   • C−3
   • D−7

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   Explanation and discussion