SOLVING QUADRATIC EQUATIONS BY COMPLETING THE SQUARE WORKSHEET

Solve for exact values of x by completing the square:

Problem 1 :

x2 + 4x + 1 = 0

Solution

Problem 2 :

x2 - 4x + 1 = 0

Solution

Problem 3 :

x2 + 6x + 2 = 0

Solution

Problem 4 :

x2 - 14x + 46 = 0

Solution

Problem 5 :

x2 = 4x + 3

Solution

Problem 6 :

x2 + 6x + 7 = 0

Solution

Problem 7 :

x2 = 2x + 6

Solution

Problem 8 :

x2 + 6x = 2

Solution

Problem 9 :

x2 + 10 = 8x

Solution

Problem 10 :

x2 + 6x = -11

Solution

Answer Key

1)  x = -2  ± √3

2)  x = 2  ± √3

3)  x = -3  ± √7

4)  x = 7  ± √3

5)  x = 2  ± √7

6)  x = -3  ± √2

7)  x = 1  ± √7

8)  x = -3  ± √11

9)  x = 4 ± √6

10)  no real solutions

Solve for exact values of x by completing the square :

Problem 1 :

2x+ 4x + 1 = 0

Solution

Problem 2 :

2x2 - 10x + 3 = 0

Solution

Problem 3 :

3x2 + 12x + 5 = 0

Solution

Problem 4 :

3x2 = 6x + 4

Solution

Problem 5 :

5x2 - 15x + 2 = 0

Solution

Problem 6 :

4x2 + 4x = 5

Solution

Answer Key

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