check the discriminants: b^2-4ac
If the discriminant is zero, there is only one root.
There are 5 quadratics below. Four of them have two distinct roots each. The other has only one distinct root; find the value of that root.
4x^2 +16x - 9
2x^2 + 80x + 400
x^2 - 6x - 9
4x^2 - 12x + 9
-x^2 + 14x + 49
1 answer