Elementary Algebra Skill

Solving Quadratic Equations by Factoring Solve each equation by factoring. 1) x 2 − 9 x + 18 = 0

2) x 2 + 5 x + 4 = 0

3) n 2 − 64 = 0

4) b 2 + 5b = 0

5) 35n 2 + 22n + 3 = 0

6) 15b 2 + 4b − 4 = 0

7) 7 p 2 − 38 p − 24 = 0

8) 3 x 2 + 14 x − 49 = 0

9) 3k 2 − 18k − 21 = 0

10) 6k 2 − 42k + 72 = 0

11) x 2 = 11 x − 28

12) k 2 + 15k = −56

13) 3m 2 = −16m − 21

14) 8 x 2 = 30 + 43 x

15) x 2 + 17 x + 49 = 3 x

16) m 2 = 2m

17) 2k 2 − 14 = −3k

18) 3v 2 + 36v + 49 = 8v

19) 10 x 2 − 26 x = −12

20) 15 p 2 + 80 = −80 p

Answers to Solving Quadratic Equations by Factoring 1) {3, 6} 3 1 5) − , − 7 5 9) {7, −1} 7 13) − , −3 3 7 17) − , 2 2

{ } { } { }

2) {−1, −4} 2 2 6) − , 3 5 10) {3, 4} 5 14) − , 6 8 7 18) − , −7 3

{ } { } { }

3) {8, −8} 4 7) − , 6 7 11) {7, 4} 15) {−7}

{ }

19)

{ } 3 ,2 5

4) {−5, 0} 7 8) , −7 3 12) {−8, −7} 16) {2, 0}

{ }

20)

{

4 − , −4 3

}

Solving by Factoring Worksheet.pdf

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