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Use the discriminant to identify the conic section whose equation is given, and find a viewing window that shows a complete graph. $$3 x^{2}+2 \sqrt{3} x y+y^{2}+4 x-4 \sqrt{3} y-16=0$$

Short Answer

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Question: Identify the conic section represented by the given equation and suggest an appropriate viewing window for the graph. Equation: $$y^2 + 2\sqrt{3}xy + 3x^2 + 4x - 4\sqrt{3}y - 16 = 0$$ Answer: The given equation represents a slanted or oblique parabola. An exact viewing window is challenging to define manually; it is recommended to use a graphing calculator or graphing software to find a suitable viewing window for the graph.

Step by step solution

01

Calculate the discriminant

To find the discriminant, we need to look at the coefficients of the squared and cross terms in the given equation. The coefficients are: $$A = 3$$ $$B = 2\sqrt{3}$$ $$C = 1$$ The discriminant is calculated using the formula: $$D = B^2 - 4AC$$ Plugging in the values: $$D = (2\sqrt{3})^2 - 4(3)(1)$$ $$D = 12 - 12 = 0$$
02

Classify the conic section

Using the discriminant value, we can classify the given conic section: - If D > 0: Hyperbola - If D = 0: Parabola - If D < 0: Ellipse In our case, D = 0, which means the conic section is a parabola.
03

Rearrange the equation into the general parabolic form

A parabola can have two different types of general forms, either: $$y=ax^2+bx+c$$ (opening up or down) or, $$x=ay^2+by+c$$ (opening left or right). We'll first try to rearrange the given equation into the first form: $$y^2 + 2\sqrt{3}xy + 3x^2 + 4x - 4\sqrt{3}y - 16 = 0$$ We can simplify it by dividing both sides by 2\sqrt{3}: $$\frac{1}{2 \sqrt{3}}y^2 + \frac{2\sqrt{3}}{2\sqrt{3}}xy + \frac{3}{2\sqrt{3}}x^2 + \frac{4}{2\sqrt{3}}x - \frac{4\sqrt{3}}{2\sqrt{3}}y - \frac{16}{2 \sqrt{3}} = 0$$ $$\frac{1}{2 \sqrt{3}}y^2 + xy + \frac{3\sqrt{3}}{2}x^2 + \frac{2\sqrt{3}}{3}x - 2y - \frac{8\sqrt{3}}{3} = 0$$ Since we could not easily rearrange the equation into the form of $$y=ax^2+bx+c$$, we will try rearranging it into the second form: $$3x^{2}+2\sqrt{3}xy + y^2 + 4x - 4\sqrt{3}y - 16$$ We can see that it is difficult to rewrite the given equation into any of the standard parabolic forms. Thus, it appears that it describes a slanted or oblique parabola.
04

Find a viewing window

As determining an exact viewing window for slanted parabolas is challenging, it is recommended to use a graphing calculator or any graphing software to find a suitable viewing window. However, if you wish to manually find a rough estimate for a viewing window, you may begin by setting the discriminant of the quadratic equation of either x or y to 0 and solve for one variable. Then you could incrementally increase the range of your window until the parabola's full graph is discernible. While this may be more approximate, the use of graphing tools is strongly preferred to obtain more accurate viewing windows.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Conic Sections
Conic sections are curves obtained by intersecting a plane with a double-napped cone. They play a vital role in the field of algebra and geometry, as they model various real-world situations. The primary types of conic sections are:
  • Circle: Formed when the intersecting plane is perpendicular to the cone's axis.
  • Ellipse: Occurs when the plane's angle with the cone's axis is less than that of the cone.
  • Parabola: Happens when the plane is parallel to the slope of the cone.
  • Hyperbola: Results if the plane angle is greater than that of the cone.
These curves can be represented by quadratic equations, and distinguishing between them requires specific techniques such as the use of the discriminant.
Parabola Identification
Identifying a parabola among conic sections involves using certain characteristics inherent to its shape and equation. The discriminant—a value derived from the quadratic equation—provides a clear method to differentiate a parabola from other conic sections.

In quadratic equations of the form \[ Ax^2 + Bxy + Cy^2 + Dx + Ey + F = 0 \]
  • The discriminant \( D \) is defined as: \( D = B^2 - 4AC \).
  • If \( D = 0 \), then the conic section is a parabola.
In the current problem, the discriminant is zero, hence confirming the equation represents a parabola. This approach is a powerful method for parabola identification.
Quadratic Equation Analysis
A quadratic equation involving two variables can be analyzed to determine the nature of the curve it represents. This process involves examining the coefficients of the terms in the equation.
  • The coefficients \( A \), \( B \), and \( C \) in the quadratic equation represent the squared and the product terms of the variables.
  • The discriminant, \( D = B^2 - 4AC \), indicates the type of conic section.
  • If \( D = 0 \), the equation usually signifies a parabola, which is the case here.
By using these coefficients, one can unravel the specific shape and orientation of the conic section, providing valuable insight into its geometric properties.
Math Problem Solving Steps
When solving math problems in conic sections, following systematic steps is key. We'll use the current example to demonstrate these steps.

Step 1: Identify and Write Down Coefficients
  • Here, \( A = 3 \), \( B = 2\sqrt{3} \), \( C = 1 \).
Step 2: Calculate the Discriminant
  • Use the formula \( D = B^2 - 4AC \), resulting in \( D = 0 \).
Step 3: Classify the Conic Section
  • Since \( D = 0 \), it is classified as a parabola.
  • However, rearranging into standard parabolic form revealed it as an oblique parabola.
Step 4: Determine a Viewing Window
  • For an accurate view, graphing tools are highly recommended.
This structured approach aids in efficiently tackling conic sections problems.

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