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If f(x) = 5x − 4 and the domain is (−3, 2], what is the range?

Answer and explanation

Correct answer: (−19, 6]

The function f(x)=5x−4 is linear and has positive slope 5, so it is strictly increasing on the entire domain. Therefore its output values follow the same endpoint order as the input interval. At the lower boundary, x approaches −3 from the right. The corresponding limiting output is 5(−3)−4=−19, but x=−3 is excluded, so −19 is not included in the range. At the upper boundary, x=2 is included and gives f(2)=5(2)−4=6, so 6 is included. Hence the range is (−19,6], which is option A. Option B incorrectly includes the output −19; option C merely repeats the domain, and option D reverses or miscalculates the endpoint values.

Related tags

Real-Valued-FunctionsRangeLinear-FunctionReal Valued FunctionsTheir Domain And RangeReal Valued Functions Their Domain And RangeRelations And FunctionsMathematicsClass 11 Mcq

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