Exercise 5 Page 237

When multiplying real numbers, the product will be positive if the signs are the same and it will be negative if the signs are different. cc Same Sign & Different Signs (+)(+)=(+) & (+)(-)=(-) (-)(-)=(+) & (-)(+)=(-) We will use the Associative Property of Multiplication to multiply the first two numbers first. There are two negative numbers so the product will be positive.

-4(- 2)

MultNegNegOnePar

- a(- b)=a* b

4* 2

Multiply

Multiply

8

Now we will multiply the remaining two numbers. The result of the first multiplication was positive and the third number is negative, so the final product will be negative.

8(- 8)

MultPosNeg

a(- b)=- a * b

-8*8

Multiply

Multiply

- 64

We can verify this using a calculator.