One of the five quadratics below has a repeated root. (The other four have distinct roots.) What is the repeated root?
-x^2 + 18x + 81
3x^2 - 6x + 9
8x^2 - 30x + 32
25x^2 - 30x - 9
x^2 - 28x + 196
+2165
One of the five quadratics below has a repeated root.
(The other four have distinct roots.) What is the repeated root?
To have a repeated root, a and c both have to be positive squares.
There is only one of the listed quadratics that fits this description.
x2 – 28x + 196 factors to (x – 14)(x – 14) ——>> x = +14
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