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

Question

0

280

1

+78

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

ILikeSushi Aug 10, 2022

edited by ILikeSushi Aug 10, 2022

BuilderBoi · Answer 1 · 2022-08-10T01:52:23

If a quadratic has a repeated root, the discriminant ( $b^2 - 4ac$ ) is equal to 0.

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