Graphing Parabolas Using Desmos

Find the vertex if the focus is at (9,0) and the directrix is at x=-9

• (-9,0)

• (0,9)

• (0,0)

• (0,-9)

Using this graph, find p.

• -6

• 6

• 12

• -12

Find the vertex if the focus is at (-4,-3) and the directrix is at x=2

• (-1,-3)

• (-4,0)

• (-10,-3)

• (0,0)

What is the vertex of this parabola?
\left(x-4\right)^2=8\left(y+5\right)

• (3,4)

• (4,-5)

• (-5,4)

• (-4,-3)

If the focus is 5 units to the RIGHT of the vertex, the directrix is...

• 5 units to the left of the vertex

• 5 units to the right of the vertex

• 5 units below the vertex

• 5 units above the vertex

Where is the axis of symmetry for this parabola?

• x = −1

• x = 0

• y = 3

• x = −3

If we have the equation y=ax²+bx+c, how can we can find the x-coordinate of the vertex?

• -a

• -b/a

• b/2a

• -b/2a

The graph of a quadratic function is called a

• Parabola

• Vertex

• Axis of Symmetry 

• Vertex Form

In order to graph a quadratic equation in standard form, the first two steps are to use the equation _____ to find the axis of symmetry (which is the x coordinate of the vertex), and then you can plug that value back into the equation to find the _____.

• -b/2a, y coordinate of the vertex

• (x-h)^2, y-intercept
  

• (x-r1), solution

• ax^2, vertex

What is the vertex of y=x²+4x+3?

• (2,1)

• (-2,1)

• (0,0)

• (-2,-1)