Best Way to Solve a Quadratic

The quadratic equation can be used to solve quadratic equations that can or cannot be factored.

• True

• False

What is this formula?

• This is the speed of light formula.

• This is the quadratic formula.

• This is the zero product property.

• This is scary.

Which is true of the quadratic formula?

• It is always the best way to solve a quadratic equation.

• It can be used to solve any quadratic equation but the arithmetic is long.

• It is best used when a = 1

• It cannot be used if the c value = 0.

For the function below, is the discriminant positive, negative, or zero?___________y = x² + 4x + 4

• Positive

• Negative

• Zero

• Not Sure

Solve: x² + 3x - 18 = 0

• x = -3 and x = 6

• x = 3 and x = -6

• x = -9 and x = 2

• x = 9 and x = -2

What is the axis of symmetry?

• the slope of the graph

• the dividing line for a parabola

• a way to spin my pencil

• the x-axis

Find the zeros of the equation: 
(x+10)(x-2) = 0

• 10 and 2

• -2 and 10

• -10 and 2

• -2 and -10

Find the zero(s) of the function: y = x² + 4.75x + 4.375

• 3.5 and 1.25

• 3 and 1.33

• -3 and 1.33

• -3.5 and -1.25

Based on the table, which function can best be used to model this situation?

• h(t) = 99t² + 858

• h(t) = -4.9t² + 295t + 0.6

• h(t) = -4.9t² + 295t + 2

• h(t) = 99t² + 1,470.3

What are the zeros of the quadratic function?
y = x² - 2x - 15

• x = -2
  x = -15

• x = -3
  x = 5

• x = 3
  x = -5

• x = 1
  x = -16