+0  
 
0
116
4
avatar

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

\(\begin{align*} &-x^2 + 18x + 81 \\ &3x^2 - 6x + 9 \\ &8x^2 - 32x + 32 \\ &25x^2 - 30x - 9 \\ &x^2 - 14x + 196 \end{align*}\)
 

 Apr 2, 2022
 #1
avatar
0

The answer is 3/5.  (This is the repeated root of 25x^2 - 30x - 9.)

 Apr 2, 2022
 #2
avatar
0

But is says that it is wrong

Guest Apr 2, 2022
 #3
avatar+23198 
0

8x2 - 32x + 32  =  8(x2 - 4x + 4)  =  8(x - 2)(x - 2)  has double root = 2.

 Apr 2, 2022
 #4
avatar
0

thanks

 Apr 2, 2022

24 Online Users

avatar
avatar