Module 8 (M8) - Algebra - Surds Surds are irrational numbers containing a square root sign. They are square roots of numbers that are not square. Irrational numbers cannot be expressed as fractions.

Notice this is different to the square root symbol because there is a small subscript 3 in front of the \(\sqrt{}\). Using the cube root button on the calculator we see that \(\sqrt[3]{1728}\) ...