Vocabulary
Crossing the Line
High or Low
Graphing
Plugging in Points
100
Every quadratic equation has a U-shaped graph called this.
What is parabola?
100
What is the equation for finding the axis of symmetry? (Hint: we also use this to find the vertex)
What is x = -b/2a
100
Name the vertex y= x^2 - 6x + 4
What is (3,-5)?
100
If the equation of the parabola is y = -x^2 + 5x will the graph open up or down?
What is down?
100
What does the c value of the equation tell us?
What is the y-intercept?
200
The highest or lowest point on a parabola.
What is the vertex?
200
Name the y-intercept y=x^2 - x - 2
What is (0,-2)?
200
Name the vertex y= x^2 - 2x + 1
What is (1, 0)?
200
What is the vertex of the graph?
(0,0)
200
If your vertex was at (2, 4) what would be a good point to pick to plug in?
What is x=3 or x=1?
300
When a quadratic equation is written in this form
y = ax^2 +bx + c
What is the standard form?
300
Name the y-intercept. y=x^2 - 4
What is (0,-4)?
300
Name the vertex y=-x^2 + 4x + 1
What is (2,5)?
300
What is the y-intercept of the graph?
(0,-3)
300
If your vertex was at (-3, 2) what would be a good point to pick to plug in?
What is x= -2 or x= -4?
400
This is the number before the x^2 that determines whether a parabola opens up or down.
What is the leading coefficient?
400
Name the x-intercepts.
y=2(x-2)(x+6)
What is (2,0) and (-6,0)?
400
Name the vertex
x^2 - 4x - 5 = 0
What is (2,-9)?
400
Graph the equation. Must include vertex, and at least one point on each side. y=x^2 - 6x + 5
What is graph on board?
400
Plug in -3 into the equation y = -x^2 + 2x + 10.
What is (-3, -5)?
500
The line that runs through the vertex and divides the parabola in half.
What is axis of symmetry?
500
Name the x-intercepts
Y=(x)(x-2)
What is (0,0) and (2,0)?
500
Name the vertex
2x^2 + 4x - 6 = 0?
What is (-1,-8)?
500
Graph the equation. Must include vertex, and at least one point on each side.
-x^2 -6x + 1 = 0
What is graph on board
500
Plug in x = 2 for the equation y= -x^2 - x + 2
(2, -4)