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 + 8
-x^2 + 4x + 5
9x^2 - 6x + 1
2x^2 - 8x + 4
225x^2 - 30x + 9
Find the one where the discriminant (b^2-4ac) = 0 THAT is the one with nly ONE root
then use the Quadratic Formula (or factoring) to slve for that root x = ........