Algebra I Lesson 2-5

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Algebra ILesson 2-5

• Multiplication of Real Numbers

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Review

• Always remember that multiplication can be
  modeled as repeated addition.
• Ex 3(-2) (-2) (-2) (-2) -6
• Therefore the product of a positive and a
  negative number will always be negative.

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Investigation of Multiplication
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Multiplying Real Numbers

1. (-3)(4)(-2)
2. (-1/2)(-2)(-3)
3. (-1)4

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Products with Variable Factors

1. (-2)(-x)
2. 3(-n)(-n)(-n)
3. (-1)(-a)2
4. -(y)4

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Properties of Multiplication
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Evaluating a Variable Expression

• Evaluate the expression when x -5
• -4(-1)(-x)
• (-9.7x)(-2)

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Using Multiplication in Real Life

• Displacement is the change in position of an
  object. Unlike distance and like velocity, it
  has a value and a direction, positive, negative
  or zero.
• A flying squirrel descends from a tree at a
  velocity of -6 ft per sec. Find vertical
  displacement after 3.5 secs.

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Applications of Negative Products

• A grocery store sells pint baskets of
  strawberries as loss leaders, which means the
  store loses money selling them. The store hopes
  to make up the loss with additional sales to
  customers coming in to buy them. The store loses
  .17 per pint. How much will be lost if selling
  3450 pints?

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Questions GP 1 4, 8 12, 14, 15HW 18
57(3rd), 64 67