Math Problem Statement

Solve the equation 3x^2 + 2y^2 - 6x - 12y + 15 = 0

Solution

The equation visible in the image is:

3x2+2y26x12y+15=03x^2 + 2y^2 - 6x - 12y + 15 = 0

This appears to be the equation of a conic section. Let's analyze and simplify the equation to determine its type (ellipse, circle, hyperbola, or parabola) and potentially its center, axes, and orientation.

To do this, we can attempt to complete the square for both xx and yy.

Steps to solve:

  1. Group xx-terms and yy-terms together: (3x26x)+(2y212y)+15=0(3x^2 - 6x) + (2y^2 - 12y) + 15 = 0

  2. Factor out constants from the quadratic terms: 3(x22x)+2(y26y)+15=03(x^2 - 2x) + 2(y^2 - 6y) + 15 = 0

  3. Complete the square for xx-terms and yy-terms:

    • For x22xx^2 - 2x, add and subtract (1)2(1)^2: x22x+1=(x1)21x^2 - 2x + 1 = (x - 1)^2 - 1
    • For y26yy^2 - 6y, add and subtract (3)2(3)^2: y26y+9=(y3)29y^2 - 6y + 9 = (y - 3)^2 - 9
  4. Substitute these completed squares back into the equation: 3((x1)21)+2((y3)29)+15=03\left((x - 1)^2 - 1\right) + 2\left((y - 3)^2 - 9\right) + 15 = 0 Simplify the equation: 3(x1)23+2(y3)218+15=03(x - 1)^2 - 3 + 2(y - 3)^2 - 18 + 15 = 0 3(x1)2+2(y3)26=03(x - 1)^2 + 2(y - 3)^2 - 6 = 0 3(x1)2+2(y3)2=63(x - 1)^2 + 2(y - 3)^2 = 6 (x1)22+(y3)23=1\frac{(x - 1)^2}{2} + \frac{(y - 3)^2}{3} = 1

Conclusion:

This is the equation of an ellipse with center at (1,3)(1, 3), semi-major axis 3\sqrt{3}, and semi-minor axis 2\sqrt{2}.

Would you like further details or have any questions on this problem?

Relative Questions:

  1. How do you determine the type of conic section from a general quadratic equation?
  2. What are the steps to complete the square for a general quadratic equation?
  3. How do you find the center and axes of an ellipse?
  4. How do you derive the lengths of the semi-major and semi-minor axes from the equation of an ellipse?
  5. What conditions make an ellipse become a circle?

Tip:

When completing the square, always factor out coefficients from the squared terms before proceeding, as this simplifies the calculation and avoids errors.

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Math Problem Analysis

Mathematical Concepts

Algebra
Conic Sections
Ellipses
Completing the Square

Formulas

Conic Section Equation: Ax^2 + By^2 + Cx + Dy + E = 0
Completing the Square Formula: (x - h)^2 + (y - k)^2 = r^2

Theorems

Method of Completing the Square
Properties of Ellipses

Suitable Grade Level

Grades 10-12