Use the quadratic equation y = x^2 + 3x – 10.

Where does the vertex of the parabola lie?

A.
below the x-axis

B.
above the x-axis

C.
on the x-axis

D.
on the y-axis

Question

Use the quadratic equation y = x^2 + 3x – 10.
 
    Where does the vertex of the parabola lie?
 
 A.
below the x-axis
 
 B.
above the x-axis
 
 C.
on the x-axis
 
 D.
on the y-axis

anonymous · Answer

first coordinate of the vertex is always $-\frac{b}{2a}$ in your case it is 
$$-\frac{3}{2}$$ 
to find the second coordinate, replace $x$ by $-\frac{3}{2}$ and see what you get

anonymous · Answer

i am fairly sure that the answer will be negative, so it lies below the x - axis

anonymous · Answer

ty