Pre-Algebra Examples

Graph 18x^2+2y^2-126x+2y+203=0
Step 1
Find the standard form of the ellipse.
Tap for more steps...
Step 1.1
Subtract from both sides of the equation.
Step 1.2
Complete the square for .
Tap for more steps...
Step 1.2.1
Use the form , to find the values of , , and .
Step 1.2.2
Consider the vertex form of a parabola.
Step 1.2.3
Find the value of using the formula .
Tap for more steps...
Step 1.2.3.1
Substitute the values of and into the formula .
Step 1.2.3.2
Simplify the right side.
Tap for more steps...
Step 1.2.3.2.1
Cancel the common factor of and .
Tap for more steps...
Step 1.2.3.2.1.1
Factor out of .
Step 1.2.3.2.1.2
Cancel the common factors.
Tap for more steps...
Step 1.2.3.2.1.2.1
Factor out of .
Step 1.2.3.2.1.2.2
Cancel the common factor.
Step 1.2.3.2.1.2.3
Rewrite the expression.
Step 1.2.3.2.2
Cancel the common factor of and .
Tap for more steps...
Step 1.2.3.2.2.1
Factor out of .
Step 1.2.3.2.2.2
Cancel the common factors.
Tap for more steps...
Step 1.2.3.2.2.2.1
Factor out of .
Step 1.2.3.2.2.2.2
Cancel the common factor.
Step 1.2.3.2.2.2.3
Rewrite the expression.
Step 1.2.3.2.3
Move the negative in front of the fraction.
Step 1.2.4
Find the value of using the formula .
Tap for more steps...
Step 1.2.4.1
Substitute the values of , and into the formula .
Step 1.2.4.2
Simplify the right side.
Tap for more steps...
Step 1.2.4.2.1
Simplify each term.
Tap for more steps...
Step 1.2.4.2.1.1
Raise to the power of .
Step 1.2.4.2.1.2
Multiply by .
Step 1.2.4.2.1.3
Cancel the common factor of and .
Tap for more steps...
Step 1.2.4.2.1.3.1
Factor out of .
Step 1.2.4.2.1.3.2
Cancel the common factors.
Tap for more steps...
Step 1.2.4.2.1.3.2.1
Factor out of .
Step 1.2.4.2.1.3.2.2
Cancel the common factor.
Step 1.2.4.2.1.3.2.3
Rewrite the expression.
Step 1.2.4.2.2
Subtract from .
Step 1.2.5
Substitute the values of , , and into the vertex form .
Step 1.3
Substitute for in the equation .
Step 1.4
Move to the right side of the equation by adding to both sides.
Step 1.5
Complete the square for .
Tap for more steps...
Step 1.5.1
Use the form , to find the values of , , and .
Step 1.5.2
Consider the vertex form of a parabola.
Step 1.5.3
Find the value of using the formula .
Tap for more steps...
Step 1.5.3.1
Substitute the values of and into the formula .
Step 1.5.3.2
Cancel the common factor of .
Tap for more steps...
Step 1.5.3.2.1
Cancel the common factor.
Step 1.5.3.2.2
Rewrite the expression.
Step 1.5.4
Find the value of using the formula .
Tap for more steps...
Step 1.5.4.1
Substitute the values of , and into the formula .
Step 1.5.4.2
Simplify the right side.
Tap for more steps...
Step 1.5.4.2.1
Simplify each term.
Tap for more steps...
Step 1.5.4.2.1.1
Cancel the common factor of and .
Tap for more steps...
Step 1.5.4.2.1.1.1
Factor out of .
Step 1.5.4.2.1.1.2
Cancel the common factors.
Tap for more steps...
Step 1.5.4.2.1.1.2.1
Factor out of .
Step 1.5.4.2.1.1.2.2
Cancel the common factor.
Step 1.5.4.2.1.1.2.3
Rewrite the expression.
Step 1.5.4.2.1.2
Cancel the common factor of .
Tap for more steps...
Step 1.5.4.2.1.2.1
Cancel the common factor.
Step 1.5.4.2.1.2.2
Rewrite the expression.
Step 1.5.4.2.2
Subtract from .
Step 1.5.5
Substitute the values of , , and into the vertex form .
Step 1.6
Substitute for in the equation .
Step 1.7
Move to the right side of the equation by adding to both sides.
Step 1.8
Simplify .
Tap for more steps...
Step 1.8.1
Combine the numerators over the common denominator.
Step 1.8.2
Simplify the expression.
Tap for more steps...
Step 1.8.2.1
Add and .
Step 1.8.2.2
Divide by .
Step 1.8.2.3
Add and .
Step 1.9
Divide each term by to make the right side equal to one.
Step 1.10
Simplify each term in the equation in order to set the right side equal to . The standard form of an ellipse or hyperbola requires the right side of the equation be .
Step 2
This is the form of an ellipse. Use this form to determine the values used to find the center along with the major and minor axis of the ellipse.
Step 3
Match the values in this ellipse to those of the standard form. The variable represents the radius of the major axis of the ellipse, represents the radius of the minor axis of the ellipse, represents the x-offset from the origin, and represents the y-offset from the origin.
Step 4
The center of an ellipse follows the form of . Substitute in the values of and .
Step 5
Find , the distance from the center to a focus.
Tap for more steps...
Step 5.1
Find the distance from the center to a focus of the ellipse by using the following formula.
Step 5.2
Substitute the values of and in the formula.
Step 5.3
Simplify.
Tap for more steps...
Step 5.3.1
Raise to the power of .
Step 5.3.2
One to any power is one.
Step 5.3.3
Multiply by .
Step 5.3.4
Subtract from .
Step 5.3.5
Rewrite as .
Tap for more steps...
Step 5.3.5.1
Factor out of .
Step 5.3.5.2
Rewrite as .
Step 5.3.6
Pull terms out from under the radical.
Step 6
Find the vertices.
Tap for more steps...
Step 6.1
The first vertex of an ellipse can be found by adding to .
Step 6.2
Substitute the known values of , , and into the formula.
Step 6.3
Simplify.
Step 6.4
The second vertex of an ellipse can be found by subtracting from .
Step 6.5
Substitute the known values of , , and into the formula.
Step 6.6
Simplify.
Step 6.7
Ellipses have two vertices.
:
:
:
:
Step 7
Find the foci.
Tap for more steps...
Step 7.1
The first focus of an ellipse can be found by adding to .
Step 7.2
Substitute the known values of , , and into the formula.
Step 7.3
The first focus of an ellipse can be found by subtracting from .
Step 7.4
Substitute the known values of , , and into the formula.
Step 7.5
Simplify.
Step 7.6
Ellipses have two foci.
:
:
:
:
Step 8
Find the eccentricity.
Tap for more steps...
Step 8.1
Find the eccentricity by using the following formula.
Step 8.2
Substitute the values of and into the formula.
Step 8.3
Simplify the numerator.
Tap for more steps...
Step 8.3.1
Raise to the power of .
Step 8.3.2
One to any power is one.
Step 8.3.3
Multiply by .
Step 8.3.4
Subtract from .
Step 8.3.5
Rewrite as .
Tap for more steps...
Step 8.3.5.1
Factor out of .
Step 8.3.5.2
Rewrite as .
Step 8.3.6
Pull terms out from under the radical.
Step 9
These values represent the important values for graphing and analyzing an ellipse.
Center:
:
:
:
:
Eccentricity:
Step 10