3.1H Lesson 3 Rewriting Quadratics

Multiple Choice

Does this parabola have a minimum or maximum and what is its value?

• minimum: 2
• maximum: 2
• minimum: 5
• maximum: 5

Multiple Choice

Use the picture to find the vertex and axis of symmetry

• Vertex (3,8) Axis x = 3

• Vertex (3,8) Axis y = 3

• Vertex (8,3) Axis x = 3

• Vertex (8,3) Axis y = 3

Finding the vertex from standard form

​x= -b/2a

y = x² - 10x + 28
a = 1
b = -10
c = 28

​x = -(b)/2a
= -(-10)/2(1)
= 10/2
x = 5

​y = (5)² - 10(5) +28
= 25 -50 + 28
y = 3

VERTEX (5, 3)

​find a, b, c

​plug x into the original equation and solve for y

Multiple Choice

Which quadratic function is represented by the graph?

• y = 2(x - 4)² + 5
• y = 2(x + 4)² + 5
• y = -2(x - 4)² + 5
• y = -2(x + 4)² + 5