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On real numbers, (a*b=a+b+ab) is defined. Which element does not have an inverse?

Answer and explanation

Correct answer: (-1)

Step 1: The identity is (0). Step 2: From (a*x=0), (a+x+ax=0\Rightarrow x(1+a)=-a). If (a=-1), no value of (x) can satisfy it. Step 3: If the denominator in an inverse formula becomes zero, check that element separately.

Related tags

Binary OperationsInverse ExistenceReal NumbersExceptionRelations And FunctionsMathematicsClass 12 Mcq

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