Conic Parabolas in General Form

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SUMMARY

The discussion focuses on solving the conic parabola represented by the equation y² - 8x + 4y + 12 = 0. Participants emphasize the need to convert this equation into the standard form of a parabola, specifically (y - k)² = 4p(x - h) for horizontal orientation or (x - h)² = 4p(y - k) for vertical orientation. Key components to determine include the vertex, focus, axis of symmetry, directrix, direction, and the value of p. Completing the square for the y terms is essential to achieve the standard form necessary for analysis.

PREREQUISITES
  • Understanding of conic sections, specifically parabolas
  • Knowledge of completing the square in algebra
  • Familiarity with the standard forms of parabolas
  • Basic skills in manipulating algebraic equations
NEXT STEPS
  • Study the process of completing the square for quadratic equations
  • Learn about the properties of parabolas, including vertex and focus
  • Explore online resources or tutorials specifically on conic sections
  • Practice converting various quadratic equations into standard forms
USEFUL FOR

Students studying algebra, particularly those tackling conic sections, as well as educators seeking resources to teach the properties and applications of parabolas.

chaze
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Homework Statement



y2 - 8x + 4y + 12 = 0

I need to find the vertex, focus, axis of symmetry, directrix, direction and p.

Homework Equations



N/A

The Attempt at a Solution



No attempt as this is the first one I've encountered in general form. I'm not even looking for an answer, but if someone knows where to find a website or tutorial which helps in solving a conic parabola in this form then it would be very helpful.
 
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chaze said:

Homework Statement



y2 - 8x + 4y + 12 = 0

I need to find the vertex, focus, axis of symmetry, directrix, direction and p.

Homework Equations



N/A

The Attempt at a Solution



No attempt as this is the first one I've encountered in general form. I'm not even looking for an answer, but if someone knows where to find a website or tutorial which helps in solving a conic parabola in this form then it would be very helpful.
There are a couple of basic forms.
(y - k)2 = 4p(x - h)

(x - h)2 = 4p(y - k)

The first form above opens to the left or right, depending on whether p is negative or positive.

The second form opens down or up, depending on whether p is negative or positive.

In both, the vertex of the parabola is at (h, k), the focus is inside the parabola, and |p| units from the vertex, located on the axis of symmetry. The directrix is on the outside of the parabola, and |p| units the other way from the vertex.

For your problem, put the y terms on one side and the x terms on the other, and complete the square in the y terms. It should look like the first form above.
 

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