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At which point does f(x)=|x| attain its minimum value?

Answer and explanation

Correct answer: (0,0)

The governing concept is the absolute-value function and its graph. For every real number x, |x| denotes the distance of x from zero, so it can never be negative: |x|≥0. The least possible distance is 0, and this occurs only when x=0. Therefore f(0)=|0|=0, so the graph has its vertex and unique minimum point at (0,0); option A is correct. The points (1,1) and (−1,1) lie on the V-shaped graph, but their function value is 1, which is larger than 0. The point (0,1) is not on the graph because substituting x=0 gives y=0, not y=1. Thus the minimum value is 0 and it is attained at the point (0,0).

Related tags

Relations-FunctionsAbsolute-ValueMinimum-ValueGraphsGraphs Of Standard FunctionsRelations And FunctionsMathematicsClass 11 Mcq

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