Answer:
D. is zero
Step-by-step explanation:
Graph of the Parabola
The quadratic function's graph is called a parabola. There is a clear relationship between the roots of the equation and the shape of the parabola.
If the equation has two real roots, the parabola has two x-intercepts. If the equation has only one real root, the parabola crosses the x-axis only once, and if the equation has no real roots, the parabola never crosses the x-axis.
If the equation of the parabola is
[tex]y=ax^2+bx+c[/tex]
Then the so-called discriminant is
[tex]d=b^2-4ac[/tex]
If the discriminant is zero, the equation has only one real root. The graph in the image only goes through the x-axis once.
Thus, the correct answer is
D. is zero
