The number or expression under a radical sign for which a root is being found. In √25, the number 25 is the radicand.
From Latin 'radicandus' meaning 'to be rooted,' from 'radix' (root). The term was coined in mathematical texts as radical notation became standardized, providing precise vocabulary for the components of radical expressions.
The radicand is like the 'input' to the root function - it's what we're trying to 'unpack' or find the original factor of! Interestingly, the domain restrictions we learn about (like 'no negative radicands under even roots') reveal deep connections between algebra and the complex number system.
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