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Review of the Distributive Property of Multiplication Notes

Review of the Distributive Property of Multiplication Notes. What is the distributive property? Distributive property – a mathematical property used to rewrite expressions involving addition or subtraction and multiplication.

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Review of the Distributive Property of Multiplication Notes

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  1. Review of the Distributive Property of Multiplication Notes What is the distributive property? Distributive property – a mathematical property used to rewrite expressions involving addition or subtraction and multiplication. Ex #1: a(b – c) rewrite as a(b + (-c)) a (b) + a (-c) ab – ac Ex #2: 2(x + 1) 2∙x + 2∙1 2x + 2

  2. Recall – Solving Linear Equations (isolate the variable) • You must use the properties of equalityto solve an equation. Ex #1 2x + 5 = 13 - 5 - 5 (subtract 5 from each sides) 2x = 8 (divide each side by 2) 2 2 x = 4 Example #2 7x + 2 = 9x + 3 7x + 2 = 9x -7x -7x (subtract 7x from each side) 2 = 2x + 3 (subtract 3 from each side) - 3 -3 -1 = 2x (divide each side by 2) -1 = 2x 2 2 -½ = x

  3. Multi-step equations (w/distributive property) Use the distributive property Example #1 3(x + 5) 3(x) + 3(5) 3x + 15 Example #2 2(3x –10) Rewrite as 2(3x + (-10)) 2(3x) + 2(-10) 6x – 20 Example #3 -(x - 5) Rewrite as -1(x + (-5)) -1(x) + (-1)(-5) -1x + 5 Now, try these • -4(x – 4) b) 10(x + 10) c) 7(x – 3) d) -(-x – 1)

  4. Solutions to “Try These” Now, try these • -4(x – 4) Rewrite as -4(x + (-4)) -4(x) + -4(-4) -4x + 16 • 10(x + 10) 10∙x + 10 ∙10 10x + 100 • 7(x – 3) Rewrite as 7(x + (-3)) 7 ∙ x + 7(-3) 7x + (-21) OR 7x – 21 d) -(-x – 1) Rewrite as -1(-1x + (-1)) (-1)(-1x) + (-1)(-1) 1x + 1 OR x +1

  5. Solving Multi-step Equations (isolate the variable) Additional examples: Ex #4 2g + 3(g + 1) = 13 (distribute 3 to everything in parenthesis) 2g + 3(g) + 3(1) = 13 2g + 3g + 3 = 13 (combine like terms) 5g + 3 = 13 - 3 -3 (subtract 3 from each side) 5g = 10 (divide each side by 5) 5 5 g = 2 Ex #5 x + x + x + 3x = 24 (combine like terms) 6x = 24 (divide each side by 6) 6 6 x = 4

  6. Vocabulary Terms Distributive Property - a mathematical property used to rewrite expressions involving addition or subtraction and multiplication. Terms – the parts of an expression separated by addition or subtraction. Ex. 2x +3 ( 2x and 3 are the terms) Like terms – terms in an expression with the same variable raised to the same power. Ex. x3 + x2 + 3x3 (3x3 & x3 are like terms) Variable – a letter that represents an unknown number Properties of equality- whatever operation is done to one side of an equation must be done to the other to isolate the variable. Isolate – to get alone on one side of the equal sign. Equivalent Expressions - expressions of different forms that can be proven equal by substituting a number for the unknown. Ex. 4x + 4 , 4(x+1) and x + x +x +x + 4 are equivalent expressions

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