Mathematics
Functions
Easy

Question

The range of square root of vertical line x vertical line minus x end root text  is  end text

  1. left parenthesis 0 comma straight infinity right parenthesis
  2. left square bracket 0 comma straight infinity right parenthesis
  3. left parenthesis negative straight infinity comma 0 right parenthesis
  4. left parenthesis negative straight infinity comma 0 right square bracket

The correct answer is: left square bracket 0 comma straight infinity right parenthesis


    text  If  end text x greater or equal than 0 text  then  end text square root of vertical line x vertical line minus x end root equals square root of x minus x end root equals 0
text  If  end text x less than 0 text  then  end text square root of vertical line x vertical line minus x end root equals square root of negative x minus x end root equals square root of negative 2 x end root greater than 0
therefore text  Range  end text equals left square bracket 0 comma straight infinity right parenthesis

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