+0  
 
0
4
1
avatar+523 

One of the five quadratics below has a repeated root.  (The other four have distinct roots.)  What is the repeated root?

x^2 - 2x + 1

x^2 - 4x - 4

x^2 + 6x - 9

x^2 + 26x + 25

x^2 - 5x + 4

 Apr 1, 2024
 #1
avatar+128399 
+1

The first one

 

We can  tell if it  has a repeated root if  the  discriminant =  0 

 

So

 

(-2)^2  -4(1) (1)  = 

4 - 4 =  

0

 

cool cool cool

 Apr 1, 2024

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