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On (\mathbb{R}), (a*b=a+b+ab). Which condition is necessary and sufficient for (a*b=b)?

Answer and explanation

Correct answer: (a=0) or (b=-1)

Step 1: From (a+b+ab=b), we get (a+ab=0). Step 2: Factor it as (a(1+b)=0). Step 3: Hence (a=0) or (b=-1); factoring is very useful in such condition-based questions.

Related tags

Binary OperationsEquationConditionReal NumbersRelations And FunctionsMathematicsClass 12 Mcq

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