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## Answers

For instance, √7 would be a surd, since it is a well-formed expression referencing the positive root of x^2 - 7; meanwhile, √ is not an expression, so it isn't a surd.

Surds are unresolved radicals, such as

square root of 2

cube root of 5

These are examples of surds that are irrational numbers, since they cannot be expressed as ratios of integers.