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Date ___________________

Quadratic Equations
(Answer ID # 0668358)
Use the discriminant to determine the nature of each quadratic equation's roots.

1.   -9x2 - 5x + 1 = 0
2.  
-9x2 + x  =  7
3.  
10x2 + 30x  =  
-22
1

2
4.  
-10
2

3
x + 8  =  
5
1

3
x2
5.   -9x2 + 12x - 4 = 0
6.  
-5
1

3
x2 - 
4
2

3
  =  -2x
7.  
18x2 + 66x + 42  =  0
8.  
-17
1

2
x2 + 42x  =  
-3
1

2
9.  
-10x2 - x + 5  =  3x
10.  
-9x2 + 2x  =  7
11.   4x2 - 4x + 1 = 0
12.  
4x2 - 4x + 1  =  0
13.   -3x2 + 11x - 8 = 0
14.  
-2

3
x2 + 
1

3
x - 
2

3
  =  0
15.  
11x  =  2x2 + 8

 

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