MATH 110 Lecture Notes - Lecture 2: Negative Number
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Likewise, zero divided by any nonzero number is zero. Important note: dividing by zero is (cid:1688)undefined(cid:1689) and is not permitted. and are not permitted. has no answer and does not have a unique answer. An exponent is a positive or negative number placed above and to the right of a quantity. It expresses the power to which the quantity is to be raised or lowered. In 43, 3 is the exponent and 4 is called the base. It shows that 4 is to be used as a factor three times. 4 4 4 (multiplied by itself twice). 43 is read as four to the third power (or four cubed). Remember that x 1 = x and x 0 = 1 when x is any number (other than 0). If the exponent is negative, such as 3 2, then the base can be dropped under the number 1 in a fraction and the exponent made positive.
