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What is a radical called when it works out to an irrational number?
AA surd
BA ratio
CA power
DA digit
Answer & Solution
Correct answer: A. A surd
1. A radical is a number written under a root sign.
2. A surd is a radical which results in an irrational number.
3. The square root of 9 is not a surd, because it works out to the whole number 3.
4. The square root of 7 is a surd, because no fraction of two integers is equal to it.
_Source: Siyavula Mathematics Grade 11 (Everything Maths, CC BY 4.0), Chapter 1: Exponents and surds_
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