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Name _____________________________
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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