# When you square a binomial, you can apply the FOIL method to find the product. You can also apply the following rules as a short cut.

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2 Squaring a Binomial When you square a binomial, you can apply the FOIL method to find the product. You can also apply the following rules as a short cut. Solve. (x 3) 2 Step 1 Square the first term. Rules for Squaring a Binomial 1. Square the first term. 2. Find 2 times the product of the two terms; use the same operation sign as the one between the two terms. 3. Square the last term. Step 2 Find 2 times the product of the two terms; use the same operation sign as the one between the two terms. x is the first term (x x) x 2 2(x 3) 2(3x) 6x Use the plus sign. Step 3 Square the last term (x 3) 2 x 2 6x 9 Solve. 1. (5x 2) 2 Square the first term. 5x is the first term Find 2 times the product of the two terms; use the same operation sign as the one between the two terms. (5x 5x) 2(5x 2) 2(10x) Use the Square the last term (5x 2) 2 sign. 2. (x 4) 2 3. (x 8) 2 4. (2x 6) 2 5. (4x 4) 2 6. (6x 12) 2 Saddleback Educational Publishing 2006 (888)

3 Adding Polynomials When you add two polynomials, you do so by adding like terms. Terms are like terms if they have the same variable raised to the same power. Like Terms Not Like Terms 2x 2, 4x 2 5x 4, 4x 5 Rules for Adding Polynomials 1. Write each polynomial in standard form. 2. Line up like terms. 3. Add the numbers in front of each variable. (Remember 1 is understood to be in front of a variable with no number). Add. (4x 2 2x 5) (3x 4 3x 5x 2 ) Step 1 Write each polynomial in standard form. (4x 2 2x 5) (3x 4 5x 2 3x) Step 2 Line up like terms. 4x 2 2x 5 3x 4 5x 2 3x Step 3 Add the numbers in front of each variable. Add. 4x 2 2x 5 3x 4 5x 2 3x 3x 4 9x 2 1x 5 1. (16x 3 5 2x 2 ) (5 3x 3 x 2 ) Write each polynomial in standard form. (16x 3 2x 2 5) Line up like terms. 16x 3 2x 2 5 Add the numbers in front of each variable. 16x 3 2x ( 2x 3 5 3x) (2x 3 2x 3x 2 ) 3. (15 4x 2 x 3 ) (5x 3 10 x 2 ) 4. (5xy 3 2x 2 y) (14 5x 2 y xy) 5. (7 5y 3 3y 4 ) (2y 2 y 4 12y 3 ) 56 Saddleback Educational Publishing 2006 (888)

4 Subtracting Polynomials When you subtract two polynomials, you do so by subtracting like terms. Terms are like terms if they have the same variable raised to the same power. Like Terms Not Like Terms 3x 3, x 3 5x, x 5 Rules for Subtracting Polynomials 1. Write polynomials in standard form. 2. Line up like terms. 3. Change the sign of each term in the second polynomial. 4. Add the numbers in front of each variable. (Remember, 1 is understood to be in front of a variable with no number). Subtract. (2x 2 5x 3 1) (5 5x 2 3x 3 ) Step 1 Write polynomials in standard form. (5x 3 2x 2 1) (3x 3 5x 2 5) Step 2 Line up like terms. 5x 3 2x 2 1 (3x 3 5x 2 5) Step 3 Change the sign of each term in the second polynomial. Step 4 Add the numbers in front of each variable Subtract. 5x 3 2x 2 1 3x 3 5x 2 5 5x 3 2x 2 1 ( 3x 3 5x 2 5) 2x 3 3x (x 5 4x 2 ) (10 3x 2 5x) Write polynomials in standard form. (4x 2 x 5) Line up like terms. 4x 2 x 5 Change the sign of each term in the second polynomial. Add the numbers in front of each variable 4x 2 x 5 4x 2 x 5 2. (x 2 5 4x 3 ) ( 10 2x 2 5x 3 ) 3. ( 4 x 3 3x 2 ) (5x 5x 2 14) 4. ( 3x x) (9 4x 2 10x) 5. ( 4x 3 12 x) ( 5x 10x 2 3) Saddleback Educational Publishing 2006 (888)

5 Multiplying a Polynomial When you multiply a polynomial by a monomial, you multiply each term of the polynomial by the monomial. When you multiply one term by another, you multiply the numbers in front of each term. You also apply the rules for multiplying exponents by adding exponents. (5x 2 )(2x 3 ) 10x 5 (2x 3 )(3xy) 6x 4 y Rules for Multiplying a Polynomial by a Monomial Multiply each term in the polynomial by the monomial: 1. Multiply the numbers in front of the variables. (Remember that 1 is understood to be in front of a variable with no number) 2. Add the exponents of variables of the same letter (Remember that 1 is understood to be the exponent of a variable with no exponent.) Multiply. 4x(2x 2 x 6) Step 1 Multiply each term in the polynomial by the monomial. (4x)(2x 2 ) 8x 3 (4x)(x) 4x 2 (4x)( 6) 24x 8x 3 4x 2 24x Multiply. 1. 3x 3 (4x 2 2x 1) Multiply each term in the polynomial by the monomial. (3x 3 )(4x 2 ) (3x 3 )(2x) (3x 3 )( 1) 2. 7x 2 ( 3x 3 2) 3. 2x 4 ( 4x 2 x 3) 4. x 2 (3x 5 6x 3 x) 5. 5x 4 ( 4x 4 2x 3 5) 58 Saddleback Educational Publishing 2006 (888)

6 Factoring a Binomial By applying the Distributive Property in reverse, you can factor out a common factor (5 4) (5 3) 5 (4 3) Rules for Factoring Out the Greatest Common Factor: Factoring Binomials 1. Find the greatest common factor of all the terms. 2. Determine the terms that when multiplied by the greatest common factor will result in each original term. 3. Rewrite the expression with the greatest common factor outside the parentheses and the terms you found in Step 2 inside the parentheses. Factor out the greatest common factor: 5x 2 10x Step 1 Find the greatest common factor of all the terms. Step 2 Determine the terms that when multiplied by the greatest common factor will result in each original term. Step 3 Rewrite the expression with the greatest common factor outside the parentheses and the terms you found in Step 2 inside the parentheses. List the factors of 5x 2 and 10x. 5x 2 : 1, 5, x 2 10x: 1, 2, 5, 10, x The greatest common factor is 5x. (5x) (x) 5x 2 (5x) (2) 10x 5x (x 2) Factor out the greatest common factor x 4 15x 3 Find the greatest common factor of all the terms. Determine the terms that when multiplied by the greatest common factor will result in each original term. Rewrite the expression with the greatest common factor outside the parentheses and the terms you found in Step 2 inside the parentheses. List all the factors of 10x 4 and 15x 3. 10x 4 : 1, 2, 5, 10, x 4 15x 3 : 1, 3, 5, 15, x 3 The greatest common factor is. ( )( ) 10x 4 ( )( ) 15x 3 ( ) 2. 27x 4 9x x 3 24x 4. 5x 2 y 5 15xy 7 Saddleback Educational Publishing 2006 (888)

7 Finding the Greatest Common Factor for Variable Terms The greatest common factor can also be found for two or more variable terms. To find the greatest common factor for variable terms, you apply the rules you have learned for finding the greatest common factor of two or more numbers. Rules for Finding the Greatest Common Factor for Variable Terms 1. List all the factors of the coefficients (the number in front of the variable). 2. From the lists, identify the greatest common factor; this is the coefficientpart of the greatest common factor. 3. List the variables with their exponents. 4. From the list, select the variable with the lowest exponent. Find the greatest common factor of 30x 3, 40x 6, and 50x 7. Step 1 List all the factors of the coefficients (the number in front of the variable). Step 2 From the list, identify the greatest common factor; this is the coefficientpart of the greatest common factor. 30: 1, 2, 3, 5, 6, 10, 15, 30 40: 1, 2, 4, 5, 8, 10, 20, 40 50: 1, 2, 5, 10, 25, 50 Of the factors listed, 10 is the greatest common factor. Step 3 List the variables with their exponents. The variable part of each term: x 3, x 6, x 7. Step 4 From the list, select the variable with the lowest exponent. Find the greatest common factor for each list of terms m 3 n 2 and 18m 5 n 4 List all the factors of the coefficients (the number in front of the variable). From the list, identify the greatest common factor; this is the coefficientpart of the greatest common factor. List the variables with their exponents. From the list, select the variable with the lowest exponent. The variable with the lowest exponent is x 3. The greatest common factor is 10x 3. 12: 1, 2, 3, 4, 6, 12 18: Of the factors listed, common factor. 2. 6x 4 and 8x x 8 and 20x 9 is the greatest m 3 n 2 m 3 n 2 m 5 n m 2 and 3m x 4 y 3 and 6xy 2 The variable with the lowest exponents are m 3 and. The greatest common factor is m 3 60 Saddleback Educational Publishing 2006 (888)

8 Factoring a Polynomial By applying the Distributive Property in reverse, you can factor out a common factor (5 4) (5 3) 5 (4 3) Rules for Factoring Out the Greatest Common Factor: Factoring Polynomials 1. Find the greatest common factor for all of the terms. 2. Determine the terms that when multiplied by the greatest common factor will result in each original term. 3. Rewrite the expression with the greatest common factor outside the parentheses and the terms found in Step 2 inside the parentheses. Factor out the greatest common factor. 20x 5 10x 6 15x 4 Step 1 Find the greatest common factor for all of the terms. Step 2 Determine the terms that when multiplied by the greatest common factor will result in each original term. Step 3 Rewrite the expression with the greatest common factor outside the parentheses and the terms found in Step 2 inside the parentheses. Factor out the greatest common factor x 8 26x 4 39x 2 Find the greatest common factor for all of the terms. Determine the terms that when multiplied by the greatest common factor will result in each original term. Rewrite the expression with the greatest common factor outside the parentheses and the terms found in Step 2 inside the parentheses. List the factors of 20x 5, 10x 6, and 15x 4. 20x 5 1, 2, 4, 5, 10, 20, x 5 10x 6 1, 2, 5, 10, x 6 15x 4 1, 3, 5, 15, x 4 The greatest common factor is 5x 4. (5x 4 ) (4x) 20x 5 ; (5x 4 )(2x 2 ) 10x 6 (5x 4 )( 3) 15x 4 5x 4 (4x 2x 2 3) List all the factors of 13x 8, 26x 4, and 39x 2. 13x 8 : 26x 4 : 39x 2 : The greatest common factor is 13x 2. 13x 2 (x 6 ) 13x 8 13x 2 ( ) 26x 4 13x 2 ( ) 39x 2 13x 2 (x 6 ) 2. 8x 3 24x 2 80x 4. x 2 2x 5 9x x 4 30x 3 48x x 5 6x 4 y 45x 3 y 2 Saddleback Educational Publishing 2006 (888)

9 Factoring Trinomials in the Form x 2 bx c You can also factor a polynomial. When you factor a polynomial you look for pairs of expressions whose product (when they are multiplied) is the original polynomial. (x 2) (x 4) x 2 6x 8 Rules for Factoring a Trinomial in the Form x 2 bx c 1. Create a table. The left column lists the factors of c. The right column is the sum of the factors in column Choose the pair of factors in the right column whose sum equals b. 3. Create two expressions of x the factors. Factor: x 2 9x 18 Step 1 Create a table. The left column lists the factors of c. The right column is the sum of the factors in column 1. FACTORS OF 18 SUM OF FACTORS 1 and and and Step 2 Choose the pair of factors in the right column whose sum equals b. Step 3 Create two expressions of x the factors. The last pair of factors, 3 and 6, have a sum (9) that equals the value of b. The factors are: (x 3)(x 6). Factor. 1. x 2 8x 12 Create a table. The left column lists the factors of c. The right column is the sum of the factors in column 1. Note that since b is negative, we are using negative numbers for the factors of c. Choose the pair of factors in the right column whose sum equals b. Create two expressions of x the factors. FACTORS OF 12 1 and 12 2 and 6 3 and 4 2. x 2 4x 3 4. x 2 8x x 2 9x 8 5. x 2 15x 36 SUM OF FACTORS The pair of factors and have a sum that equals the value of b,. The factors are: (x ( 2))(x ( 6)) or (x 2)(x 6) 62 Saddleback Educational Publishing 2006 (888)

10 Factoring Trinomials in the Form ax 2 bx c You can use FOIL to multiply binomials, creating a trinomial. You can also use FOIL to undo a trinomial, creating two binomials. Factor. 6x 2 23x 7 Step 1 Create a FOIL table. Rules for Factoring Trinomials in the Form ax 2 bx c 1. Create a FOIL table. 2. In the F column place factors that result in a. In the L column place factors that result in c. 3. In the O and I columns, try different combinations of the factors from Step 2 by adding the products. The combination resulting in b shows the placement within the binomials. Step 2 In the F column, place factors that result in a. In the L column, place factors that result in c. Step 3 In the O I column, try different combinations of the factors from Step 2 by adding the products. The combination resulting in b shows the placement within the binomials. Factor. 1. 5x 2 14x 3 Create a FOIL table. In the F column, place factors that result in a. In the L column, place factors that result in c. In the O I column, try different combinations of the factors from Step 2 by adding the products. The combination resulting in b shows the placement within the binomials. 6x 2 23x 7 F O I? L x 2 8x x 2 8x x 2 3x x 2 7x x 2 50x Value for b The outer terms are 2 and 1. The inner terms are 7 and 3. 6x 2 23x 7 (2x 7)(3x 1) 5x 2 14x 3 F O I? L ( 1) 5 (3) ( 1) 1 5x 2 14x 3 ( x )( x ) Value for b 2 1 ( 3) Saddleback Educational Publishing 2006 (888)

11 The Difference of Two Squares The difference of squares involves multiplying two binomials with the same two terms. One binomial is the sum of the terms for example, (a 2 b). The other binomial is the difference of the terms for example, (a 2 b). As you can see, the two terms are a 2 and b. When you multiply the two squares, the product follows a pattern. Rules for the Difference of Squares 1. Square the first term. 2. Square the second term. 3. Place a minus sign between the two squared terms. Solve. (x 2 4)(x 2 4) Step 1 Square the first term. (x 2 ) 2 (x 2 )(x 2 ) x 4 Step 2 Square the second term. (4) Step 3 Place a minus sign between the two squared terms. Solve. Remember when you multiply terms with exponents, you add the exponents. Result of the first squaring: x 4 Result of the second squaring: 16 x (x 4 y)(x 4 y) Square the first term. (x 4 ) 2 (x 4 )(x 4 ) Square the second term. (y) 2 (y)(y) Place a minus sign between the two squared terms. 2. (x 3 y 2 )(x 3 y 2 ) 3. (x 5 5)(x 5 5) 4. (2x 3 4)(2x 3 4) 5. (4x 2 3)(4x 2 3) 6. (3x 4 y 2 )(3x 4 y 2 ) The result of the first squaring is. The result of the second squaring is. 64 Saddleback Educational Publishing 2006 (888)

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