# Algebra Examples

Consider the vertex form of the parabola.

Rewrite the function in terms of and .

Use the form , to find the values of , , and .

Consider the vertex form of a parabola.

Find the value of using the formula .

Multiply by to get .

Reduce the expression by cancelling the common factors.

Factor out of .

Cancel the common factor.

Rewrite the expression.

Divide by to get .

Multiply by to get .

Find the value of using the formula .

Simplify each term.

Multiply by to get .

Raise to the power of to get .

Multiply by to get .

Divide by to get .

Multiply by to get .

Subtract from to get .

Substitute the values of , , and into the vertex form .

Reorder the right side of the equation to match the vertex form of a parabola.

Use the vertex form, , to determine the values of , , and .

Since the value of is positive, the parabola opens up.

Opens Up

Find the vertex .

Find the distance from the vertex to a focus of the parabola by using the following formula.

Substitute the value of into the formula.

Reduce the expression by cancelling the common factors.

Cancel the common factor.

Rewrite the expression.

The focus of a parabola can be found by adding to the y-coordinate if the parabola opens up or down.

Substitute the known values of , , and into the formula and simplify.

Find the axis of symmetry by finding the line that passes through the vertex and the focus.

The directrix of a parabola is the horizontal line found by subtracting from the y-coordinate of the vertex if the parabola opens up or down.

Substitute the known values of and into the formula and simplify.

Use the properties of the parabola to analyze and graph the parabola.

Direction: Opens Up

Vertex:

Focus:

Axis of Symmetry:

Directrix: