MATH 110 Lecture Notes - Lecture 26: Multiplication Sign, Cube Root, Negative Number
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Note: this subject is introduced in the pre algebra section (see chapter ). The symbol is called a radical sign and is used to designate square root. When two designate cube root, a small three is placed above the radical sign, radical signs are next to each other, they automatically mean that the two are multiplied. 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. Simplify: a, b, if each variable is nonnegative (not a negative number), If each variable could be positive or negative (deleting the restriction (cid:1688)if each variable is nonnegative(cid:1689)), then absolute value signs are placed around variables to odd powers: e. If each variable could be positive or negative, then you would write: g. If each variable could be positive or negative, you would write: h.
