# Math 10-C Polynomials Concept Sheets

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1 Math 10-C Polynomials Concept Sheets Concept 1: Polynomial Intro & Review A polynomial is a mathematical expression with one or more terms in which the exponents are whole numbers and the coefficients are real numbers. whole number exponents 6 e.g. x y 3 5-5x x + 3 4a 4 + 6ab 3a 3 b real number coefficients A monomial is a product of a coefficient and one or more variables. e.g. 6x -3a 3 b variable (x) coefficient coefficient variables (a and b) Binomial polynomial with terms Trinomial polynomial with 3 terms Like Terms terms that have the same variable(s) to the same degree For example: 3 x, 4x ; 3 3 x y, 3x y To add and subtract polynomials, collect like terms. Example Simplify the following polynomials. (a) 4x 3y x (b) 6a 4a a 6a PAGE 1

2 Concept : Multiplying Polynomials Methods for multiplying large whole numbers without the use of a calculator: Example: Multiple 18 x 4 without a calculator. Method #1: Grid Multiplication Method #: Rainbow Method Examples involving polynomials: Expand and simplify. (a) (c + 3)(c 7) Method 1 : Use a grid diagram. PAGE

3 Method : Use the distributive property. (c + 3)(c 7) = c(c 7) + 3(c 7) = (c)(c) + (c)( 7) + (3)(c) + (3)( 7) = c 7c + 3c 1 Combine like terms. = c 4c 1 (b) (3k + 4)(k k 7) Method 1 : Use a grid diagram. Method : Use the distributive property. Multiply each term in the trinomial by each term in the binomial. (3k + 4)(k k 7) = (3k)(k k 7) + 4(k k 7) = (3k)(k ) + (3k)( k) + (3k)( 7) + 4(k ) + 4( k) + 4( 7) = 3k 3 6k 1k + 4k 8k 8 = 3k 3 6k + 4k 1k 8k 8 Combine like terms. = 3k 3 k 9k 8 PAGE 3

4 (c) ( x 1)(5x 3) 3(x 4)(6x ) Method 1: Grid Multiplication - Complete in two parts and then combine. Method : Distributive Property ( x 1)(5x 3) 3(x 4)(6x ) ( x)(5x 3) (1)(5x 3) 3[( x)(6x ) (4)(6x )] 5x 3x 5x 3 3(1x 4x 4x 8) = 5x 8x 3 3(1x 0x 8) 5x 8x 3 36x 60x 4 41x 68x 1 Questions for Practice Page 87 #-5, 6 a, c, e, 7 a, c, e, 8 a, c, e, 9-14 PAGE 4

5 Concept 3: Factoring Polynomials Greatest Common Factor: the largest factor that two or more numbers (or terms) have in common. Methods for finding the GCF Determine the greatest common factor of 16 and 144. Method #1: List the Factors 16 1,, 3, 7, 9, 14, 18, 4, 63, ,, 3, 4, 6, 8, 9, 1, 16, 18, 4, 36, 48, 7, 144 Largest factor that 16 and 144 have in common is 18. Method #: Block Method Method #3: Prime Factorization Write the prime factorization of each number. Highlight the factors that appear in each prime factorization. 16 = = 3 3 The greatest common factor is 3 3, which is 18. Common Multiple: a number that is a multiple of two or more numbers. Lowest Common Multiple: the smallest number that two or more numbers will divide into evenly PAGE 5

6 Methods for finding the LCM Examples: (a) Determine the least common multiple of 18 and 30. Method #1: Block Method Method #: List the Multiples 18 18, 36, 54, 7, 90, 108, 30 30, 60, 90, GCF Factoring Greatest common factor (GCF) A number that divides into every term of polynomial. The GCF can be a monomial or a binomial or a trinomial. Example: Find the GCF of the following trinomial: 0c 4 d 30c 3 d 5cd Solution 0c 4 d 30c 3 d 5cd Factor each term of the trinomial. 0c 4 d = 5 c c c c d 30c 3 d = 3 5 c c c d d 5cd = 5 5 c d The greatest common factor is 5 c d = 5cd PAGE 6

7 Example: Factor the following polynomials. 4 (a) 1a 9a 3a (b) xx ( 1) 5( x 1) Questions for Practice: Page 91 #, 3, 4, 5 d, e, f, 6, 8, 9 Factoring Pictorially Algebra Tiles Recall: Represents: x x 1 -x -1 For simplicity purposes we can sketch them as: PAGE 7

8 Steps for factoring pictorially: Example: 1. Arrange algebra tiles to make a rectangle. (The coefficient of the x is the number of squares, the coefficient of the x is the number of lines and the constant number is the number of dots or x s to use.) Hint: (Keeping tiles in standard form as shown below will be an advantage). Look at the dimensions of the rectangle and write outside of the grid. 3. The factors are the outside dimensions. (a) 3x 10x 8 To check your answer, use multiplication: 3x 10x 8 (3x )( x 4) (b) x 9xy 7y x 9xy 7 y (x 7 y)( x y) Questions for Practice: Page 9 #13; Page 95 #1, PAGE 8

9 Factoring Symbolically Steps for Factoring Symbolically: 1. Draw the grid.. Put the first term in the top left and the last term in the bottom right. 3. Find the product of the coefficients of the first and last term. 4. Find two numbers that have the same product as the first and last term but add up to the coefficient of the middle term. 5. Place the numbers from step 4 in the top right and bottom left position. 6. Take the GCF out of the top row. Put the leftover value above. 7. Repeat for the second row. The factors are on the outside of the grid. Examples: Factor: (a) 8a 18a 5 (b) x 9xy 7y PAGE 9

10 Finding Missing Values in Trinomials: Example: Determine the values of b that allow the expression 3y ny 16to be factored. Therefore, b could be 49 or 6 or 19 or Questions for Practice: Page 95 #4-7 (Factoring Trinomials); Page 96 #8-11 (Finding Missing Values); Page 96 #1-19 (Word Problems) Factoring Special Cases Perfect Square Trinomials Examples: The trinomial x 4x 4 is a perfect square The first term is a perfect square: x The last term is a perfect square: The middle term is twice the product of the square root of the first term and the square root of the last term: ()(x)() = 4x Note: Always check to make sure it s a perfect square trinomial first! (a) x 10x 5 Check: x x and 5 5 and 5 10 OR ( x 5)( x 5) so ( x 5) PAGE 10

11 (b) a 1ab 36b Check: a a and 36b 6b and 6 1 ( a 6 b)( a 6 b) so ( a 6 b) Difference of Squares Difference of Squares a polynomial expressed in the form x y - results when you multiply two binomials that are the sum and the difference of the same two quantities Example: Note: Always check for a GCF first (a) k 18 = ( k 9) OR = ( k 3)( k 3) (b) 4 81 a (9 a )(9 a ) (9 a )(3 a)(3 a) Questions for Practice: Page 99 #1, a,c,e, 3 a,c,e, 4, 5-7, 8-10, Unit Review Questions Page 10 #1-18 PAGE 11

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