Grade 11
Exploring Quadratic Functions
 Find and write the definition of a quadratic function in words you understand. (use your textbook, google, etc)
Quadratic functions are curves called a parabola, which is a U shape that can face any direction.
 Give an example of a quadratic function and give an example of a function that is NOT a quadratic.
 y = 1x^2+2x+4 is a quadratic function. Y= 2x + 4 is not
 Go to desmos.com and type in the following function:
 Desmos will give you the option of adding “sliders” for or all. Click all. This will allow you to change the values of to see how the graph changes.
 Start with slider values . Describe any symmetry you notice.
The line is identical on both sides of the y axis
 Keep b = c = 0. Change the value of :

 Does the graph open up or open down?
 Does the graph have a maximum point or minimum point?

 Does the graph open up or open down?
 Does the graph have a maximum point or minimum point?

 Is the graph narrow or wide?

 Is the graph narrow or wide
 a) i) Opens down. ii) No. B) Opens up. ii) No C) Graph is wide. D) Graph is narrow.
 We call the maximum or minimum point of a quadratic function the vertex. Complete the following statements:
 When is Positive (positive/negative), the vertex is a Minimum (maximum/minimum)
 When is Negative (positive/negative), the vertex is a Maximum (maximum/minimum)
 Let and Use the slider to change the value of Describe how the graph changes as changes. Y value of the vertex

Roots are the solutions to the quadratic equation. The roots are found by looking at where the curve crosses the x axis (xintercepts).
Adjust the sliders for a, b and c so you can get a curve that just touches the x axis (y=0).
Equation: y = 4x^2
This quadratic equation has ONE solution.
Adjust the sliders so you can get the roots of 0 and 1
Equation: y = 3.4x^2 + 3.4x
This quadratic equation has TWO solution
 Find and write the definition of a quadratic function in words you understand. (use your textbook, google, etc)
Quadratic functions are curves called a parabola, which is a U shape that can face any direction.
 Give an example of a quadratic function and give an example of a function that is NOT a quadratic.
 y = 1x^2+2x+4 is a quadratic function. Y= 2x + 4 is not
 Go to desmos.com and type in the following function:
 Desmos will give you the option of adding “sliders” for or all. Click all. This will allow you to change the values of to see how the graph changes.
 Start with slider values . Describe any symmetry you notice.
The line is identical on both sides of the y axis
 Keep b = c = 0. Change the value of :

 Does the graph open up or open down?
 Does the graph have a maximum point or minimum point?

 Does the graph open up or open down?
 Does the graph have a maximum point or minimum point?

 Is the graph narrow or wide?

 Is the graph narrow or wide
 a) i) Opens down. ii) No. B) Opens up. ii) No C) Graph is wide. D) Graph is narrow.
 We call the maximum or minimum point of a quadratic function the vertex. Complete the following statements:
 When is Positive (positive/negative), the vertex is a Minimum (maximum/minimum)
 When is Negative (positive/negative), the vertex is a Maximum (maximum/minimum)
 Let and Use the slider to change the value of Describe how the graph changes as changes. Y value of the vertex

Roots are the solutions to the quadratic equation. The roots are found by looking at where the curve crosses the x axis (xintercepts).
Adjust the sliders for a, b and c so you can get a curve that just touches the x axis (y=0).
Equation: y = 4x^2
This quadratic equation has ONE solution.
Adjust the sliders so you can get the roots of 0 and 1
Equation: y = 3.4x^2 + 3.4x
This quadratic equation has TWO solutions.
Adjust the sliders so that the curve does NOT cross the xaxis.
Equation: y = x^2 + x + 1.4
When the curve does NOT cross the xaxis, there are NO REAL solutions for this equation.
s.
Adjust the sliders so that the curve does NOT cross the xaxis.
Equation: y = x^2 + x + 1.4
When the curve does NOT cross the xaxis, there are NO REAL solutions for this equation.