How many real roots exist if the discriminant of the equation = 0? IS THE ANSWER 1, 0, 2 or 4? HELP THNX?

Question

How many real roots exist if the discriminant of the equation = 0?
1
0
2
4

Answer 1

1 distinct root

Answer 2

As James K said, there is one distinct real root when the discriminant is 0. (And 2 when it is positive, and none when it is negative.)

Note that he said DISTINCT real root. Sometimes the root in this situation is referred to as a double root, so that we can say that the quadratic equation has two roots, as it is supposed to. (They just happen to be equal in this case.)

Answer 3

D= 64 - 4.16= 0 the only one soluition because x1,2 = - b ± D^1/2