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

A

anonymous · Answer

factor that ishh,
x^2+3x-10
=(x+5)(x-2)
x=-5,2 so you  have the points (0,2) and (0,-5)

the parabola passes through the x axis twice, and since the x^2 is positive, you know the vertex is below the x axis. the graph curves up like a U

your answer is A