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If f(x)=|x|+x and g(x)=|x|-x, what is their pointwise product (fg)(x)?

Answer and explanation

Correct answer: 0

For the pointwise product, (fg)(x)=f(x)g(x). Hence, (fg)(x)=(|x|+x)(|x|-x)=|x|^2-x^2=0, since |x|^2=x^2 for every real x. Option B results from an incorrect expansion that treats the factors as if their terms were simply added. Exam tip: apply the identity (a+b)(a-b)=a^2-b^2 directly.

Related tags

Relations-FunctionsAlgebra-Of-FunctionsModulusPointwise-ProductAlgebra Of Real FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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