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# PLS HELP

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

Apr 2, 2022
#2
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But is says that it is wrong

Guest Apr 2, 2022
#3
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8x2 - 32x + 32  =  8(x2 - 4x + 4)  =  8(x - 2)(x - 2)  has double root = 2.

Apr 2, 2022
#4
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thanks

Apr 2, 2022