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If R = {(x, y): y = x², x ∈ [−2, 2], y ∈ [0, 4]}, what is correct about R?

Answer and explanation

Correct answer: It is a function and its range is [0, 4].

For every x in the domain [−2,2], the rule y=x² assigns exactly one real output, so the relation is a function. To determine the range, note that the smallest value of x² on this interval is 0, attained at x=0, and the largest value is 4, attained at x=−2 or x=2. Because x varies continuously through the whole interval, every value between 0 and 4 is obtained. Hence the range is [0,4], and option A is correct. Equal outputs at x=−2 and x=2 do not violate the function rule. Option C confuses domain and range, while option D mistakes a property of the outputs for a reason that would disqualify a function.

Related tags

Quadratic FunctionIntervalRangeFunction TestFunctions As A Special Kind Of RelationRelations And FunctionsMathematicsClass 11 Mcq

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