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Which option is not a real number?

Answer and explanation

Correct answer: ( \frac{6}{0} )

Direct answer: Option B, \(\frac{6}{0}\). Division by zero is undefined, so \(\frac{6}{0}\) is not a real number. A real number must have a definite value on the number line. There is no number \(x\) satisfying \(0\times x=6\), because multiplying zero by any number gives zero. Therefore the expression cannot be assigned an ordinary real value. Option A, -8, is an integer and therefore a real number. Option B is correct because its denominator is zero, making the fraction undefined. Option C, \(\sqrt{19}\), is irrational but still real: 19 is positive, so its square root exists on the real number line. Option D, 0.45, is a terminating decimal and equals \(\frac{45}{100}=\frac9{20}\), so it is rational and real. Do not confuse an irrational number with a non-real number. Irrational numbers are still real. Remember: denominator zero means undefined, not zero and not infinity as an ordinary real answer.

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Real NumbersUndefinedDenominator

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