Chapter 9 - Basic Algebra - 9.3 Multiplying and Dividing Signed Numbers - 9.3 Exercises - Page 644: 2

To multiply two numbers with different signs, you can ignore the signs of the factors and multiply, then put a negative sign before the product as the product must be negative. Refer to the step-by-step below for the example.

The product of two numbers with the different signs is negative. Thus, to multiply two numbers with different signs, you can ignore the signs of the factors and multiply, then put a negative sign before the product as the product must be negative. Example: $-3(5) = -(3 \cdot 5) = -15$