Finding the Vertex of a Parabola

Nancy explains how to find the vertex of a parabola using both the standard and vertex forms. She demonstrates the process with examples, highlighting the formula -B/2A for the standard form and pattern matching for the vertex form. Nancy also addresses common confusions with signs in the vertex form and concludes with encouragement to practice.

What is the vertex formula you need to memorize?

• -b/2a

• b/2a

• b(2a)

• -b(2a)

How do you find the y-coordinate once you know the x-coordinate?

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what is the vertex form

• y = a(x - h)² + k

• y = a(x + h)² + k

• y = a(x-k)² + h

• y = a(x-b)² + c

Answer explanation

Greek mathematics developed around the 7th century BC.

What is the vertex of this equation?

y= 5(x - 7)² + 9

Remember to write your answer with parenthesis ( , )

Answer explanation

The symbol for division (i.e.÷) is called an obelus.

What is the vertex in this equation?

y= 7(x+9)² +4

• (9,4)

• (7,4)

• (-9,4)

• (4,9)