Algebra 1 - Topic 11 Basic Factoring Techniques Linda Fahlberg-Stojanovska
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1 lgebra 1 - Topic 11 asic Factoring Techniques Linda Fahlberg-Stojanovska MULTIPLE HOIE 1. Factor completely: 12x 2 92x. a. 4x(3x 23) c. 4x(3x 23x) b. x(12x 92) d. 4(3x 2 23x) NS: x is a common factor of both terms. So we have: 12x 2 92x = x(12x 92). gcf(12, 92) = 4. So, 12x 2 92x = x(12x 92)= 4x(3x 23). orrect! You forgot to find the common factor of the coefficients. You forgot to take out the x in the second term - oops, we all do that! You forgot to factor out x. MS: Questions 3 and 4 are similar; Q4 has a trickier answer. Linda Fahlberg-Stojanovska 1
2 2. Factor completely: 10x 2 100x. a. 5(2x 2 20x) c. 5x(2x 20) b. 10x(x 10) d. x(10x 100) NS: x is a common factor of both terms. So we have: 10x 2 100x = x(10x 100). gcf(10, 100) = 10. So, 10x 2 100x = x(10x 100)= 10x(x 10). You forgot to factor out x. orrect! You did not factor completely the coefficients! You did not find the largest common factor of the coefficients. PTS: 2 IF: Grade 8 REF: 1LG.11.0 MS: Questions 3 and 4 are similar; Q4 has a trickier answer. Linda Fahlberg-Stojanovska 2
3 3. Factor: x 2 18x 77 a. (x 18)(x 77) c. (x 7)(x 11) b. (x 7)(x 11) d. (x 7)(x 11) NS: The coefficient of x 2 is 1, so we need to find numbers: b and d such that: x 2 18x 77 (x b)(x d). The constant coefficient is 77. This means that: b d 77. The constant coefficient is positive, that is: So, the sum of b and d is the absolute value of the coefficient of x, that is: b d 18. What are b and d? b 7 and d 11. Now we need to find the signs in front of b and d. gain, the constant coefficient is: So the signs in front of b and d are the same. The coefficient of x is positive, that is: This means both signs are positive. So the sign in front of 7 is positive and the sign in front of 11 is positive. We have: x 2 18x 77 (x 7)(x 11). You did not factor at all! You need to review factoring rules. orrect! One of the signs in front of your factors is wrong. oth of the signs in front of your factors are wrong. PTS: 2 IF: Grade 8 REF: 1LG.11.0 MS: Questions 3 and 4 are the same; Q3 has longer rationale. Linda Fahlberg-Stojanovska 3
4 4. Factor: x 2 4x 77. a. (x 4)(x 77) c. (x 7)(x 11) b. (x 7)(x 11) d. (x 7)(x 11) NS: We need to find numbers: b and d such that: x 2 4x 77 (x b)(x d) where b d 77 and b d 4 (the difference since the constant coefficient 77 0). We find: b 7 and d 11. Since the constant coefficient is 77 0, the signs in front of b and d are different. Since the x coefficient is 4 0, the sign in front of the larger number 11 is positive. We have: x 2 4x 77 (x 7)(x 11). You did not factor at all! You need to review factoring rules. orrect! oth of the signs in front of your factors are wrong. One of the signs in front of your factors is wrong. PTS: 2 IF: Grade 8 REF: 1LG.11.0 MS: Questions 3 and 4 are the same; Q3 has longer rationale. Linda Fahlberg-Stojanovska 4
5 5. Factor: x 3 13x 2 30x. a. x(x 2)(x 15) c. (x 2 13)(x 30) b. (x 2)(x 2 15) d. x(x 2)(x 15) NS: We first factor out x: x 3 13x 2 30x x(x 2 13x 30). Now we factor: x 2 13x 30. We need to find numbers: b and d such that: x 2 13x 30 (x b)(x d) where b d 30 and b d 13 (the difference since the constant coefficient 30 0). We find: b 2 and d 15. Since the constant coefficient is 30 0, the signs in front of b and d are different. Since the x coefficient is 13 0, the sign in front of the larger number 15 is positive. We have: x 2 13x 30 (x 2)(x 15) so: x 3 13x 2 30x x(x 2)(x 15) orrect! You need to factor the x out first and then factor the remaining quadratic. You did not factor at all! You need to review factoring rules. One or both of the signs in front of your factors is wrong. KEY: polynomials quadratics factoring Linda Fahlberg-Stojanovska 5
6 6. Factor: 25m 2 121x 2 a. oes not factor. c. (5m 11x)(5m 11x) b. (25 x)(m 121) d. (5m 11x) 2 NS: This is the difference of two squares, namely: 25m 2 121x 2 (5m) 2 (11x) 2 (5m 11x)(5m 11x) It does factor. Look up your formulas! Wrong, but creative. Look up your formulas! orrect! Wrong formula. This generates a middle term. 7. Factor: 9g 2 64z 2 a. (3g 8z)(3g 8z) c. (9 z)(g 64) b. (3g 8z) 2 d. oes not factor. NS: This is the sum of two squares. There are no common factors. This quadratic will not factor! Wrong formula. This gives a minus between the terms. Wrong formula. This generates a middle term. Wrong, but creative. Look up your formulas! orrect! Linda Fahlberg-Stojanovska 6
7 8. Factor: x 2 6x 9. a. (x 3)(x 2) c. (x 3)(x 3) b. (x 3) 2 d. (x 3) 2 NS: We notice that the constant coefficient is positive and a perfect square, that is: We check to see if the middle term is It is. So, we have: x 2 6x 9 x From the formula, we know: x 2 6x 9 x (x 3) 2, (where the sign matches the sign in front of the x coefficient). You did not factor at all! You need to review factoring rules. Your sign is wrong. This is the wrong formula. orrect! MS: Questions 3 and 4 are the same; Q3 has longer rationale. Linda Fahlberg-Stojanovska 7
8 9. Factor: 2(4 y) j(4 y). a. oes not factor. c. 2j(4 y) 2 b. (8 y)(1 j) d. (4 y)(2 j) NS: The common factor in both terms is:. We put this factor first and see what is left: From the first term: 2 is left. Then the sign:. Finally the variable: j. So: (4 y)2 (4 y)j (4 y)(2 j) It does factor. o you see something the same in both terms? No. o not multiply anything. Simply factor out the common term. No. You forgot the sign between the terms. orrect! MS: The conditions move the relative position of the factors. Linda Fahlberg-Stojanovska 8
9 10. Factor: 2x 2 32x 34. a. 2(x 1)(x 17) c. 2(x 16)(x 17) b. 2(x 1)(x 17) d. (x 1)(x 17) NS: The leading coefficient can be factored out from the other coefficients: 2x 2 32x 34 2(x 2 16x 17). Now we factor: x 2 16x 17. We need to find numbers: b and d such that: x 2 16x 17 (x b)(x d) where b d 17 and b d 16 (the difference since the constant coefficient 17 0). We find: b 1 and d 17. Since the constant coefficient is 17 0, the signs in front of b and d are different. Since the x coefficient is 16 0, the sign in front of the larger number 17 is positive. We have: x 2 16x 17 (x 1)(x 17). The answer is: 2x 2 32x 34 2(x 1)(x 17) orrect! heck your signs. You are guessing. Find the roots and then use them to factor. You forgot to multiply by the leading coefficient. PTS: 3 IF: Grade 8 REF: 1LG.11.0 MS: Questions 3 and 4 are the same; Q3 has longer rationale. Linda Fahlberg-Stojanovska 9
10 11. Factor using roots: x 2 12x 35. a. (x 5)(x 7) c. (x 5)(x 7) b. (x 5)(x 7) d. (x 12)(x 35) NS: For x 2 12x 35, we have: a 1, b 12 and c 35. Using the quadratic formula: x 1,x 2 12 (12) Using a calculator (if necessary), we have: x 1,x 2 x and x We have: x 2 12x 35 (x 5)(x 7) (Remember to subtract your roots.) 7 orrect! One of the signs in front of your factors is wrong. You need to subtract the roots. oth of your signs are wrong. Wow is this wrong! Use the quadratic formula to find the roots. PTS: 2 IF: Grade 8 REF: 1LG.11.0 MS: Questions 3 and 4 are the same; Q3 has longer rationale. Linda Fahlberg-Stojanovska 10
11 12. Factor: 5x 2 54x 40. a. (5x 4)(x 10) c. (x + 4 )(x + 10) 5 b. (5x 4)(x 10) d. 5(x 54)(x 40) NS: The leading coefficient cannot be factored out from the other coefficients. So, it is probably easiest to factor by finding the roots. For 5x 2 54x 40, we have: a 5, b 54 and c 40. Using the quadratic formula: x 1,x 2 54 (54) Using a calculator (if necessary), we have: x 1,x 2 x and x 2 We have: 5x 2 54x 40 5(x (on t forget to multiply by the leading coefficient!) 4 )(x + 10) = (5x + 5 )(x + 10) =(5x 4)(x 10). 5 orrect! You forgot to subtract the roots so your signs are wrong. You forgot to multiply by the leading coefficient. You are guessing. Find the roots and then use them to factor. PTS: 4 IF: Grade 8 REF: 1LG.11.0 MS: Questions 3 and 4 are the same; Q3 has longer rationale. Linda Fahlberg-Stojanovska 11
12 NUMERI RESPONSE 1. What is the smallest of the multiples when calculating ( ) using only one multiplication? NS: What is the largest of the multiples when calculating ( ) using only one multiplication? NS: What is the smallest of the multiples when calculating ( ) using only one multiplication? NS: 60 PTS: 2 IF: Grade 8 REF: 1LG What is the smallest of the multiples when calculating ( ) using only one multiplication? NS: 50 PTS: 2 IF: Grade 8 REF: 1LG.11.0 Linda Fahlberg-Stojanovska 12
13 5. Without using a calculator, find the value of x if ( ) 183 x? NS: Without using a calculator, find the value of x if ( ) x 176? NS: 180 Linda Fahlberg-Stojanovska 13
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