18.1 Multiplying Polynomial Expressions by Monomials
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1 Name Class Date 18.1 Multiplying Polynomial Expressions by Monomials Essential Question: How can you multiply polynomials by monomials? Resource Locker Explore Modeling Polynomial Multiplication Algebra tiles can be used to model the multiplication of a polynomial by a monomial. Rules 1. The first factor goes on the left side of the grid, the second factor on the top.. Fill in the grid with tiles that have the same height as tiles on the left and the same length as tiles on the top. 3. Follow the key. The product of two tiles of the same color is positive; the product of two tiles of different colors is negative. A Use algebra tiles to find (x + 1). Then recount the tiles in the grid and write the expression. First, fill in the factors. Key = x Now fill in the table. = -x = x = -x = 1 = -1 The simplified expression for (x + 1) = x +. Module Lesson 1
2 Use algebra tiles to model x (x - 3). Then write the expression. The simplified expression for x(x - 3) = x - x. Reflect 1. Discussion How do the tiles illustrate the idea of x geometrically?. Discussion How does the grid illustrate the Distributive Property? Explain 1 Multiplying Monomials When multiplying monomials, variables with exponents may need to be multiplied. Recall the Product of Powers Property, which states that a m a n = a (m + n). Example 1 Find each product. A (6 x 3 )(-4 x 4 ) (6 x 3 )(-4 x 4 ) = (6-4)( x 3 x 4 ) = (6-4)( x ) = -4 x 7 (5 xy ) (7xy) (5 xy ) (7xy) = ( 5 ) ( x ) ( y) = ( 5 ) ( x 1 + ) ( y + 1 ) = x y Reflect 3. In the Product of Powers Property, do the bases need to be the same or can they be different? Your Turn 4. (18 y x 3 z) (3 x 8 y 6 z 4 ) Module Lesson 1
3 Explain Multiplying a Polynomial by a Monomial Remember that the Distributive Property states that multiplying a term by a sum is the same thing as multiplying the term by each part of the sum then adding the results. Example Find each product. A 3x (3 x + 6x - 5) 3x (3 x + 6x - 5) Distribute and simplify. = 3x (3 x ) + 3x (6x) + 3x (-5) = 9 x x x 1 = 9 x x - 15x xy (5x y + 3xy + 7xy) xy (5 x y + 3 xy + 7xy) = xy (5 x y) + xy ( ) + xy ( ) Distribute and simplify. = 10 x 1 + y x 1 + y x 1 + y 1 + = 10 x 3 y + x y + x y Reflect 5. Is the product of a monomial and a polynomial always a polynomial? Explain. If so, how many terms does it have? Your Turn 6. a (5b + 3ab + 6a + 1) Module Lesson 1
4 Explain 3 Multiplying a Polynomial by a Monomial to Solve a Real-World Problem Knowing how to multiply polynomials and monomials is useful when solving real-world problems. Example 3 Write a polynomial equation and solve the problem. Design Harry is building a fish tank that is a square prism. He wants the height of the tank to be 6 inches longer than the length and width. If he needs the volume to be as close as possible to 3500 in 3, what should be the length of the tank? Round to the nearest inch. Analyze Information Identify the important information Since the bases are squares, the length and width are. The height of the tank is more inches than the length. The total volume of the model should be as close as possible to in 3. Formulate a Plan Since the desired volume of the model is given, the volume formula should be used to find the answer. The volume formula for a square prism is V = and solve an equation.. Use this formula and the given information to write Solve Build the equation. Since the length and width are equal, let s represent these measurements. The volume will be V = (s s) ( ) = s ( ) = s + s. Justify and Evaluate ss + s Image Credits: Jean Michel Labat/Mary Evans Picture Library/age fotostock is closer to than any of the other results, so the length of the fish tank to the nearest whole inch should be inches. Module Lesson 1
5 Your Turn 7. Engineering Diane needs a piece of paper whose length is 4 more inches than the width, and the area is as close as possible to 50 in. To the nearest whole inch, what should the dimensions of the paper be? xx + 4x Elaborate 8. What is the power if a monomial is multiplied by a constant? 9. Essential Question Check-In What properties and rules are used to multiply a multi-term polynomial by a monomial? Evaluate: Homework and Practice Find each product. 1. (3x)( x ). (19 x 5 )(8 x 3 ) 3. (6 x 7 )(3 x 3 ) 4. (3 x )( x 3 ) 5. 7xy (3 x y 3 ) (6xyz )(5xy ) 7. 3 (8xy )(4 y 4 z ) 8. (11xy)(x 3y ) 9. 3 (x + x) (x ) Online Homework Hints and Help Extra Practice Module Lesson 1
6 10. (x 3 + x ) ( x 4 ) 11. (x + x + 5) ( x 3 ) 1. (x x 3 + x + 11x + 4) ( x ) 13. (x 3 + y + 3xy) (4 x y) 14. ( x 3 + 5y) (3xy) 15. (x x 3 y + 3xy 3 ) (6xy ) 16. (x x 3 y + 4 x y + 8xy + 1x) (11 x y 3 ) Write a polynomial equation for each situation and then solve the problem. 17. Design A bedroom has a length of x + 3 feet and a width of x feet. Find the area when x = Engineering A flat-screen television has a length that is 1 more inch than its width. The area of the television s screen is 1500 i n. To the nearest whole inch, what are the dimensions of the television? xx + x Image Credits: Peter Cade/Getty Images Module Lesson 1
7 19. Construction Zach is building a new shed shaped like a square prism. He wants the height of the shed to be feet less than the length and width. If he needs the volume to be as close as possible to 3174 f t 3, what should the length be? Round to the nearest foot. x 3 x - x 0. State whether each polynomial is also a monomial. a. x 3 Yes No b. a + a b + b c Yes No c. x x 3 Yes No 3 x d. y e. xyz + txy + tyz + txz Yes No 1. Draw the algebra tiles that model the factors in the multiplication shown. Then determine the simplified product. Yes No H.O.T. Focus on Higher Order Thinking. Critical Thinking When finding the product of a monomial and a binomial, how is the degree of the product related to the degree of the monomial and the degree of the binomial? 3. Explain the Error Sandy says that the product of x and x x + 1 is x x 4 + x. Explain the error that Sandy made. 4. Communicate Mathematical Ideas What is the lowest degree that a polynomial can have? Explain. Module Lesson 1
8 Lesson Performance Task A craftsman is making a dulcimer with the same dimensions as the one shown. The surface shown requires a special, more durable type of finish. Write a polynomial that represents the area to be finished on the dulcimer shown. b = h + 1 h b 1 = h + 1 Module Lesson 1
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