Like what you saw?
Create FREE Account and:
 Watch all FREE content in 21 subjects(388 videos for 23 hours)
 FREE advice on how to get better grades at school from an expert
 Attend and watch FREE live webinar on useful topics
The Vertex and Axis of Symmetry  Problem 4
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
The vertex of a parabola always gives either the maximum y value (if the parabola opens down) or minimum value (if the parabola opens up.) The vertex also lies along the vertical axis of symmetry. To find the vertex, here in the context of the maximum height that an object attains, you could either complete the square or use t = b/2a. Here we use the second method to find the vertical axis of symmetry, and then plug that time value to plug back in and find the maximum height. This method can be extended to any maximum (like profit, sales, area etc.) or minimum (like cost).
Transcript Coming Soon!
Please enter your name.
Are you sure you want to delete this comment?
Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
Concept (1)
Sample Problems (8)
Need help with a problem?
Watch expert teachers solve similar problems.

The Vertex and Axis of Symmetry
Problem 1 5,472 viewsFind the vertex of
f(x) = x² + 6x + 8 
The Vertex and Axis of Symmetry
Problem 2 4,493 viewsFind the vertex of f(x) = x² + 3x + 4. Write the equation for the axis of symmetry.

The Vertex and Axis of Symmetry
Problem 3 3,966 viewsA soccer ball's height in feet follows the path described by h(x) = 48x − 16x² where x is the time in seconds. After how long does the soccer ball reach its maximum height? What is that height?

The Vertex and Axis of Symmetry
Problem 4 675 views 
The Vertex and Axis of Symmetry
Problem 5 753 views 
The Vertex and Axis of Symmetry
Problem 6 598 views 
The Vertex and Axis of Symmetry
Problem 7 734 views 
The Vertex and Axis of Symmetry
Problem 8 788 views
Comments (0)
Please Sign in or Sign up to add your comment.
·
Delete