Chapter 1 - Foundations for Algebra - 1-6 Multiplying and Dividing Real Numbers - Practice and Problem-Solving Exercises - Page 43: 58

If the number of negative factors is odd, the sign of the product is negative.If the number of negative factors is even, the sign of the product is positive.

If the number of negative factors is odd, the sign of the product is negative.If the number of negative factors is even, the sign of the product is positive. This is shown by the following example: (−2)(−2)=4 (−2)(−2)(−2)=−8 (−2)(−2)(−2)(−2)=16 (−2)(−2)(−2)(−2)(−2)=−32 (−2)(−2)(−2)(−2)(−2)(−2)=64 (−2)(−2)(−2)(−2)(−2)(−2)(−2)=−128 (−2)(−2)(−2)(−2)(−2)(−2)(−2)(−2)=256