Introduction to Roots and Radicals

Note: This subject is introduced in the pre‐algebra section (see Chapter ).

The symbol equation is called a radical sign and is used to designate square root. To designate cube root, a small three is placed above the radical sign, equation. When two radical signs are next to each other, they automatically mean that the two are multiplied. The multiplication sign may be omitted. Note that the square root of a negative number is not possible within the real number system; a completely different system of imaginary numbers is used. The (so‐called) imaginary numbers are multiples of the imaginary unit i.