Section 26 Multiplying rational numbers

1
Section 2-6Multiplying rational numbers

• Numbers with the same sign have a product that is
  positive.
• Example 3 5 15
• Numbers with the opposite sign have a product
  that is negative.
• Example -3 5 -15 and 3 -5 -15

2
Section 2-6 examples

• -1 (3) -1 (3)
• -3
• -1 (6) -1 (6)
• -6
• -1 (-3) -1 (-3)
• 3
• -1 (-6) -1 (-6)
• 6

3
Section 2-6 examples cont.

• Simplify the following expressions
• (2a)(4b) 2a 4b
• 2 4 a b
• 8ab
• 3x(-3y) (-6x)(-2y)
• 3 (-3) x y -6 (-2) x y
• -9xy 12xy
• 3xy