One of the five quadratics below has a repeated root. (The other four have distinct roots.) What is the repeated root?
\(\begin{align*} &-x^2 + 18x + 81 \\ &3x^2 - 6x + 9 \\ &8x^2 - 32x + 32 \\ &25x^2 - 30x - 9 \\ &x^2 - 14x + 196 \end{align*}\)
The answer is 3/5. (This is the repeated root of 25x^2 - 30x - 9.)
But is says that it is wrong
8x2 - 32x + 32 = 8(x2 - 4x + 4) = 8(x - 2)(x - 2) has double root = 2.
thanks
