The vertex of the parabola - Examples, Exercises and Solutions

Vertex of the Parabola

The vertex of the parabola indicates the highest or maximum point of a sad-faced parabola, and the lowest or minimum point of a happy-faced parabola.

The first method to find the vertex of the parabola: (with formula)

First step: We will find the XX of the vertex according to the formula x=(b)2ax=\frac{(-b)}{2a}

Second step: We will place the XX of the vertex we have found into the original parabola equation to find the YY of the vertex.


Second method to find the vertex of the parabola: according to 2 points of intersection with the X-axis and use of symmetry

First step: Find two points of intersection of the parabola with the XX axis using the quadratic formula.

Second step: Find the XX of the vertex: the point that is exactly between two points of intersection. The calculation will be done through the average of two XXs of the intersection points.

Third step: Place the XX of the vertex we have found into the original parabola equation to solve for the YY of the vertex.

Suggested Topics to Practice in Advance

  1. The quadratic function
  2. Parabola
  3. Plotting the Quadratic Function Using Parameters a, b and c
  4. Finding the Zeros of a Parabola

Practice The vertex of the parabola

Exercise #1

Find the vertex of the parabola

y=(x+1)2 y=(x+1)^2

Video Solution

Answer

(1,0) (-1,0)

Exercise #2

Find the vertex of the parabola

y=(x1)21 y=(x-1)^2-1

Video Solution

Answer

(1,1) (1,-1)

Exercise #3

Find the vertex of the parabola

y=(x3)21 y=(x-3)^2-1

Video Solution

Answer

(3,1) (3,-1)

Exercise #4

Find the vertex of the parabola

y=x2+3 y=x^2+3

Video Solution

Answer

(0,3) (0,3)

Exercise #5

Find the vertex of the parabola

y=x2 y=x^2

Video Solution

Answer

(0,0) (0,0)

Exercise #1

Find the vertex of the parabola

y=x26 y=x^2-6

Video Solution

Answer

(0,6) (0,-6)

Exercise #2

Find the vertex of the parabola

y=(x+1)21 y=(x+1)^2-1

Video Solution

Answer

(1,1) (-1,-1)

Exercise #3

Find the vertex of the parabola

y=(x3)2 y=(x-3)^2

Video Solution

Answer

(3,0) (3,0)

Exercise #4

Find the vertex of the parabola

y=(x3)2+6 y=(x-3)^2+6

Video Solution

Answer

(3,6) (3,6)

Exercise #5

Find the vertex of the parabola

y=(x7)7 y=(x-7)-7

Video Solution

Answer

(7,7) (7,-7)

Exercise #1

Find the vertex of the parabola

y=(x+8)29 y=(x+8)^2-9

Video Solution

Answer

(8,9) (-8,-9)

Exercise #2

Find the vertex of the parabola

y=(x7)+5 y=(x-7)+5

Video Solution

Answer

(7,5) (7,5)

Exercise #3

Find the vertex of the parabola

y=(x5)5 y=(x-5)-5

Video Solution

Answer

(5,5) (5,-5)

Exercise #4

Find the vertex of the parabola

y=(x7)27 y=(x-7)^2-7

Video Solution

Answer

(7,7) (7,-7)

Exercise #5

Find the vertex of the parabola

y=(x3)210 y=(x-3)^2-10

Video Solution

Answer

(3,10) (3,-10)

Topics learned in later sections

  1. Symmetry in a parabola