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What type of number is (-\sqrt{13})?

Answer and explanation

Correct answer: Irrational real number

A square root of a positive integer is irrational when that integer is not a perfect square. Since 13 lies between the perfect squares 9 and 16, it cannot be written as the square of an integer or as a terminating fraction. Hence \(\sqrt{13}\) is irrational. It is nevertheless a real number because 13 is positive.

Putting a minus sign before an irrational real number changes its sign, not its number system or rationality. Thus \(-\sqrt{13}\) is still real and irrational. It is not rational, whole, or natural: whole and natural numbers are integers in the usual school classification, while this value is not an integer. Therefore, option A, irrational real number, is correct.

Related tags

Negative-IrrationalReal-NumbersClassification

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