Solving Quadratic Equations: Completing the Square - Answers and Solutions, Slides of Algebra

The answers and solutions to completing the square of quadratic equations. It includes 20 examples with their respective solutions. This resource is ideal for students and learners who need help understanding the completing the square method in algebra.

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2021/2022

Uploaded on 08/01/2022

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Elementary Algebra Skill
Solving Quadratic Equations: Completing the Square
Solve each equation by completing the square.
1)
x
2
+ 2
x
− 24 = 0 2)
p
2
+ 12
p
− 54 = 0
3)
x
2
− 8
x
+ 15 = 0 4)
r
2
+ 18
r
+ 56 = 0
5)
m
2
− 6
m
− 55 = 0 6)
m
2
− 4
m
− 91 = 0
7)
m
2
+ 16
m
− 32 = −7 8)
r
2
− 8
r
= −8
9)
n
2
=
−14
n
− 37 10)
n
2
− 2
n
= 15
11)
x
2
+ 15
x
+ 15 =
2 +
x
12)
−3
n
2
+ 4
n
− 59 = −4
n
2
13)
5
n
2
− 20
n
+ 6 = 0 14)
3
a
2
− 6
a
− 34 = 0
15)
3
x
2
x
− 3 = 0 16)
2
v
2
+ 5
v
− 7 = 0
17)
4
n
2
+ 11
n
= 15 18)
9
a
2
− 21 = 13
a
19)
3
m
2
− 10
m
+ 11 = 4 20)
3
m
2
− 16
m
− 2 = −7
pf2

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Elementary Algebra Skill

Solving Quadratic Equations: Completing the Square

Solve each equation by completing the square.

  1. x^2 + 2 x − 24 = 0 2) p^2 + 12 p − 54 = 0

  2. x^2 − 8 x + 15 = 0 4) r^2 + 18 r + 56 = 0

  3. m^2 − 6 m − 55 = 0 6) m^2 − 4 m − 91 = 0

  4. m^2 + 16 m − 32 = −7 8) r^2 − 8 r = −

  5. n^2 = −14 n − 37 10) n^2 − 2 n = 15

  6. x^2 + 15 x + 15 = 2 + x 12) −3 n^2 + 4 n − 59 = −4 n^2

  7. 5 n^2 − 20 n + 6 = 0 14) 3 a^2 − 6 a − 34 = 0

  8. 3 x^2 − x − 3 = 0 16) 2 v^2 + 5 v − 7 = 0

  9. 4 n^2 + 11 n = 15 18) 9 a^2 − 21 = 13 a

  10. 3 m^2 − 10 m + 11 = 4 20) 3 m^2 − 16 m − 2 = −

Answers to Solving Quadratic Equations: Completing the Square

  1. { 4 , −6} (^) 2) {−6 + 3 10 , −6 − 3 10 } 3) { 5 , 3 }
  2. {−4, −14} 5) { 11 , −5} (^) 6) {2 + 95 , 2 − 95 }
  3. {−8 + 89 , −8 − 89 }^ 8) {4 + 2 2 , 4 − 2 2 }^ 9) {−7 + 2 3 , −7 − 2 3 }
  4. { 5 , −3} 11) {−1, −13} (^) 12) {−2 + 3 7 , −2 − 3 7 }

13) {10 +^70

, 10 −^70

5 }^

14) {3 +^111

, 3 −^111

3 }^

15) {1 +^37

, 1 −^37

2 }^

4 }^ 18)^ {

, 13 −^5