Which of the following is not a real number? | $\bigcirc$ | A. $\sqrt{2}$ | | --- | --- | | $\bigcirc$ | B. $\sqrt{1}$ | | $\bigcirc$ | C. $\sqrt{6}$ | | $\bigcirc$ | D. $\sqrt{2}$ |
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Step 1
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Step 2
: Understand the definition of real numbers

- Real numbers include all rational and irrational numbers that can be represented on a number line - A number is real if it can be expressed as a point on the number line

Final Answer

D. \sqrt{- 2} is not a real number.