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Review 10.5-10.7 Conic Sections

P. H. Review 10.5-10.7 Conic Sections. C. E. We usually see conic equations written in General, or Implicit Form:. General Form of a Conic Equation. where A, B, C, D, E and F are integers and A, B and C are NOT ALL equal to zero. Please Note:.

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Review 10.5-10.7 Conic Sections

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  1. P H Review 10.5-10.7Conic Sections C E

  2. We usually see conic equations written in General, or Implicit Form: General Form of a Conic Equation where A, B, C, D, E and F are integers and A, B and C are NOT ALL equal to zero.

  3. Please Note: A conic equation written in General Form doesn’t have to have all SIX terms! Several of the coefficients A, B, C, D, E and F can equal zero, as long as A, B and C don’t ALL equal zero. If A, B and C all equal zero, what kind of equation do you have? ... T H I N K... Linear!

  4. So, it’s a conic equation if... • the highest degree (power) of x and/or y is 2 (at least ONE has to be squared) • the other terms are either linear, constant, or the product of x and y • there are no variable terms with rational exponents (i.e. no radical expressions) or terms with negative exponents (i.e. no rational expressions)

  5. The values of the coefficients in the conic equation determine the TYPE of conic. What values form an Ellipse? What values form a Hyperbola? What values form a Parabola?

  6. Ellipses... where A & C have the SAME SIGN NOTE: There is noBxy term, and D, E & Fmay equal zero! For example:

  7. This is an ellipse since x & y are both squared, and both quadratic terms have the same sign! Center (-2, 0) Hor. Axis = 2 Vert. Axis = √8 The General Form of the equations can be converted to Standard Form by completing the square and dividing so that the constant = 1. Ellipses...

  8. Vert. axis = 2/√3 center (-1, 1) Hor. axis = 2 In this example, x2 and y2 are both negative (still the same sign), you can see in the final step that when we divide by negative 4 all of the terms are positive. Ellipses...

  9. Radius = √5 Center (-2, 0) Ellipses…a special case! When A & C are the samevalue as well as the same sign, the ellipse is the same length in all directions … Circle! it is a ...

  10. Hyperbola... where A & C have DIFFERENT signs. NOTE: There is noBxy term, and D, E & Fmay equal zero! For example:

  11. This is a hyperbola since x & y are both squared, and the quadratic terms have different signs! y-axis=3 x-axis=2 Center (2,-1) The General, or Implicit, Form of the equations can be converted to Graphing Form by completing the square and dividing so that the constant = 1. Hyperbola...

  12. x-axis=2 Center (0,3) y-axis=2 In this example, the signs change, but since the quadratic terms still have different signs, it is still a hyperbola! Hyperbola...

  13. A parabola is vertical if the equation has an x squared term AND a linear y term; it may or may not have a linear x term & constant: A parabola is horizontal if the equation has a y squared term AND a linear x term; it may or may not have a linear y term & constant: A Parabola can be oriented 2 different ways: Parabola...

  14. Parabola …Vertical The following equations all represent vertical parabolas in general form; they all have a squared x term and a linear y term:

  15. Vertex (2,3) Parabola …Vertical To write the equations in Standard Form, complete the square for the x-terms. There are 2 popular conventions for writing parabolas in Graphing Form, both are given below:

  16. Vertex (-1,4) Parabola …Vertical In this example, the signs must be changed at the end so that the y-term is positive, notice that the negative coefficient of the x squared term makes the parabola open downward.

  17. Parabola …Horizontal The following equations all represent horizontal parabolas in general form, they all have a squared y term and a linear x term:

  18. Vertex (1,-4) Parabola …Horizontal To write the equations in Standard Form, complete the square for the y-terms. There are 2 popular conventions for writing parabolas in Standard Form, both are given below:

  19. Vertex (3,0) Parabola …Horizontal In this example, the signs must be changed at the end so that the x-term is positive; notice that the negative coefficient of the y squared term makes the parabola open to the left.

  20. What About the term Bxy? None of the conic equations we have looked at so far included the term Bxy. This term leads to a hyperbolic graph: or, solved for y:

  21. If there is a Bxy term: What About the term Bxy? You need to find the discriminant and use that to determine the conic section. The graph is a circle (A = C) or an ellipse (A ≠ C) The graph is a parabola The graph is a hyperbola

  22. where A, B, C, D, E and F are integers and A, B and C are NOT ALL equal to zero. Summary ... General Form of a Conic Equation: Identifying a Conic Equation:

  23. Practice ... Identify each of the following equations as a(n): (a) ellipse (b) circle (c) hyperbola (d) parabola (e) not a conic See if you can rewrite each equation into its Graphing Form!

  24. Answers ... (a) ellipse (b) circle (c) hyperbola (d) parabola (e) not a conic

  25. Write the general from of the equation fo the translation of -6x2 + 24x + 4y – 8 = 0 for T(-1,-2)

  26. Identify the graph of each equation and then find θ Ellipse Use this Formula:

  27. Identify the graph of each equation and then find θ Hyperbola Use this Formula:

  28. Identify the graph of each equation and then find θ Hyperbola Use this Formula:

  29. Solve this system of equations: Straight Line and a circle Not Factorable NO SOLUTION!!! Substitution: Step 1 Solve for a variable Step 2 Plug into other equation

  30. Solve this system of equations: Hyperbola And a straight line Step 3 Plug into step 1 to find the other variable Substitution: Step 1 Solve for a variable Step 2 Plug into other equation Solution(s):

  31. Solve this system of equations: CRICLE And a ELLIPSE Step 3 Plug into first equation to find the other variable ELIMINATION: Step 1 Make a new system Step 2 Combine to eliminate Solution(s):

  32. Solve this system of equations: Hyperbola And a Ellipse Step 3 Plug into step 1 to find the other variable Elimination: Step 1 Re-write the system: Step 2 Combine to eliminate Solution(s):

  33. Solve this system of equations: circle And a straight line Substitution: Step 1 Solve for a variable Step 3 Plug into step 1 to find the other variable Step 2 Plug into other equation Solution(s):

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