Parabolic Equations

What is the formula to find the vertex of a parabola?

• x = -b/2
• x = -b
• x = -b / (2a)
• x = -b / 2

Which letter in a quadratic formula represents the y-intercept?

• a
• b
• c

The axis of symmetry line passes through which point?

• y-intercept
• any random point
• vertex
• symmetrical point for the vertex

Which letter determines if a parabola opens up or down?

• a

• h

• k

If the a value is positive, which direction does the graph open?

• up
• down
• left
• right

If the a value is negative, which direction does the parabola open?

• up
• down
• left
• right

The equation for the axis of symmetry line is x = -b/(2a)

• true
• false

The maximum/minimum value of a parabola is which value from the ordered pair of the vertex?

• x
• y

Where does the graph
y=3(x-1) ² - 8 increase?

• (-∞,8)
• (8,∞)
• (-∞,1)
• (1,∞)

What is the vertex form for a vertex of (-3,-5) and when a=-2?

• y = -2(x-3)²+5
• y = -2(x+3)²+5
• y = -2(x+3)²-5