|Quadratic equation (in our case ) has the following solutons:|
For these solutions to exist, the discriminant should not be a negative number.
First, we need to compute the discriminant : .
Discriminant d=16 is greater than zero. That means that there are two solutions: .
Quadratic expression can be factored:
Again, the answer is: 0, -1.33333333333333.
Here's your graph: