Pre-Algebra Examples

Graph 7y-2=15y+10x^2+4
Step 1
Solve for .
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Step 1.1
Move all terms containing to the left side of the equation.
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Step 1.1.1
Subtract from both sides of the equation.
Step 1.1.2
Subtract from .
Step 1.2
Move all terms not containing to the right side of the equation.
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Step 1.2.1
Add to both sides of the equation.
Step 1.2.2
Add and .
Step 1.3
Divide each term in by and simplify.
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Step 1.3.1
Divide each term in by .
Step 1.3.2
Simplify the left side.
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Step 1.3.2.1
Cancel the common factor of .
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Step 1.3.2.1.1
Cancel the common factor.
Step 1.3.2.1.2
Divide by .
Step 1.3.3
Simplify the right side.
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Step 1.3.3.1
Simplify each term.
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Step 1.3.3.1.1
Cancel the common factor of and .
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Step 1.3.3.1.1.1
Factor out of .
Step 1.3.3.1.1.2
Cancel the common factors.
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Step 1.3.3.1.1.2.1
Factor out of .
Step 1.3.3.1.1.2.2
Cancel the common factor.
Step 1.3.3.1.1.2.3
Rewrite the expression.
Step 1.3.3.1.2
Move the negative in front of the fraction.
Step 1.3.3.1.3
Cancel the common factor of and .
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Step 1.3.3.1.3.1
Factor out of .
Step 1.3.3.1.3.2
Cancel the common factors.
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Step 1.3.3.1.3.2.1
Factor out of .
Step 1.3.3.1.3.2.2
Cancel the common factor.
Step 1.3.3.1.3.2.3
Rewrite the expression.
Step 1.3.3.1.4
Move the negative in front of the fraction.
Step 2
Find the properties of the given parabola.
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Step 2.1
Rewrite the equation in vertex form.
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Step 2.1.1
Complete the square for .
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Step 2.1.1.1
Use the form , to find the values of , , and .
Step 2.1.1.2
Consider the vertex form of a parabola.
Step 2.1.1.3
Find the value of using the formula .
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Step 2.1.1.3.1
Substitute the values of and into the formula .
Step 2.1.1.3.2
Simplify the right side.
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Step 2.1.1.3.2.1
Cancel the common factor of and .
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Step 2.1.1.3.2.1.1
Factor out of .
Step 2.1.1.3.2.1.2
Cancel the common factors.
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Step 2.1.1.3.2.1.2.1
Cancel the common factor.
Step 2.1.1.3.2.1.2.2
Rewrite the expression.
Step 2.1.1.3.2.2
Multiply the numerator by the reciprocal of the denominator.
Step 2.1.1.3.2.3
Multiply .
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Step 2.1.1.3.2.3.1
Multiply by .
Step 2.1.1.3.2.3.2
Multiply by .
Step 2.1.1.4
Find the value of using the formula .
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Step 2.1.1.4.1
Substitute the values of , and into the formula .
Step 2.1.1.4.2
Simplify the right side.
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Step 2.1.1.4.2.1
Simplify each term.
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Step 2.1.1.4.2.1.1
Raising to any positive power yields .
Step 2.1.1.4.2.1.2
Simplify the denominator.
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Step 2.1.1.4.2.1.2.1
Multiply by .
Step 2.1.1.4.2.1.2.2
Combine and .
Step 2.1.1.4.2.1.3
Multiply by .
Step 2.1.1.4.2.1.4
Divide by .
Step 2.1.1.4.2.1.5
Divide by .
Step 2.1.1.4.2.1.6
Multiply by .
Step 2.1.1.4.2.2
Add and .
Step 2.1.1.5
Substitute the values of , , and into the vertex form .
Step 2.1.2
Set equal to the new right side.
Step 2.2
Use the vertex form, , to determine the values of , , and .
Step 2.3
Since the value of is negative, the parabola opens down.
Opens Down
Step 2.4
Find the vertex .
Step 2.5
Find , the distance from the vertex to the focus.
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Step 2.5.1
Find the distance from the vertex to a focus of the parabola by using the following formula.
Step 2.5.2
Substitute the value of into the formula.
Step 2.5.3
Simplify.
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Step 2.5.3.1
Cancel the common factor of and .
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Step 2.5.3.1.1
Rewrite as .
Step 2.5.3.1.2
Move the negative in front of the fraction.
Step 2.5.3.2
Combine and .
Step 2.5.3.3
Simplify the expression.
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Step 2.5.3.3.1
Multiply by .
Step 2.5.3.3.2
Divide by .
Step 2.6
Find the focus.
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Step 2.6.1
The focus of a parabola can be found by adding to the y-coordinate if the parabola opens up or down.
Step 2.6.2
Substitute the known values of , , and into the formula and simplify.
Step 2.7
Find the axis of symmetry by finding the line that passes through the vertex and the focus.
Step 2.8
Find the directrix.
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Step 2.8.1
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.
Step 2.8.2
Substitute the known values of and into the formula and simplify.
Step 2.9
Use the properties of the parabola to analyze and graph the parabola.
Direction: Opens Down
Vertex:
Focus:
Axis of Symmetry:
Directrix:
Direction: Opens Down
Vertex:
Focus:
Axis of Symmetry:
Directrix:
Step 3
Select a few values, and plug them into the equation to find the corresponding values. The values should be selected around the vertex.
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Step 3.1
Replace the variable with in the expression.
Step 3.2
Simplify the result.
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Step 3.2.1
Combine the numerators over the common denominator.
Step 3.2.2
Simplify each term.
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Step 3.2.2.1
Raise to the power of .
Step 3.2.2.2
Multiply by .
Step 3.2.3
Simplify the expression.
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Step 3.2.3.1
Subtract from .
Step 3.2.3.2
Divide by .
Step 3.2.4
The final answer is .
Step 3.3
The value at is .
Step 3.4
Replace the variable with in the expression.
Step 3.5
Simplify the result.
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Step 3.5.1
Combine the numerators over the common denominator.
Step 3.5.2
Simplify each term.
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Step 3.5.2.1
Raise to the power of .
Step 3.5.2.2
Multiply by .
Step 3.5.3
Simplify the expression.
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Step 3.5.3.1
Subtract from .
Step 3.5.3.2
Move the negative in front of the fraction.
Step 3.5.4
The final answer is .
Step 3.6
The value at is .
Step 3.7
Replace the variable with in the expression.
Step 3.8
Simplify the result.
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Step 3.8.1
Combine the numerators over the common denominator.
Step 3.8.2
Simplify each term.
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Step 3.8.2.1
One to any power is one.
Step 3.8.2.2
Multiply by .
Step 3.8.3
Simplify the expression.
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Step 3.8.3.1
Subtract from .
Step 3.8.3.2
Divide by .
Step 3.8.4
The final answer is .
Step 3.9
The value at is .
Step 3.10
Replace the variable with in the expression.
Step 3.11
Simplify the result.
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Step 3.11.1
Combine the numerators over the common denominator.
Step 3.11.2
Simplify each term.
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Step 3.11.2.1
Raise to the power of .
Step 3.11.2.2
Multiply by .
Step 3.11.3
Simplify the expression.
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Step 3.11.3.1
Subtract from .
Step 3.11.3.2
Divide by .
Step 3.11.4
The final answer is .
Step 3.12
The value at is .
Step 3.13
Graph the parabola using its properties and the selected points.
Step 4
Graph the parabola using its properties and the selected points.
Direction: Opens Down
Vertex:
Focus:
Axis of Symmetry:
Directrix:
Step 5