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On the set of real numbers, the operation (a*b=a+b+ab) is defined. If (a\neq -1), what will be the inverse of (2)?

Answer and explanation

Correct answer: (-\frac{2}{3})

Step 1: First find the identity. Since (a*0=a), the identity is (0). Step 2: Put (2*x=0). Then (2+x+2x=0\Rightarrow 3x=-2\Rightarrow x=-\frac{2}{3}). Step 3: In exams, always identify the identity before finding an inverse.

Related tags

Binary OperationsInverseIdentityRelations And FunctionsMathematicsClass 12 Mcq

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