Math Problem Statement
X ^2 + y ^2 - 4 X -6 Y -12 is equal to 0 and X ^2 + y ^2 - 8 X -2 Y -19 is equal to 0 find coordinates of points of intersections of those two
Solution
To find the points of intersection of the two given equations, we will solve the system of equations:
Step 1: Rewrite Equations in Standard Form
First, let's rewrite each equation by completing the square for both and .
Equation 1:
To complete the square:
-
For :
Complete the square:
-
For :
Complete the square:
Substitute back into the equation:
Simplify:
This is a circle centered at with a radius of 5.
Equation 2:
To complete the square:
-
For :
Complete the square:
-
For :
Complete the square:
Substitute back into the equation:
Simplify:
This is a circle centered at with a radius of 6.
Step 2: Find Points of Intersection
Now, let's solve for the points of intersection of these two circles.
Subtract the first equation from the second:
[ [(x - 4)^2 + (y - 1)^2] - [(x - 2)^2 + (y - 3)^2] = 36 - 25 ]
Expand both squared terms:
[ [(x^2 - 8x + 16) + (y^2 - 2y + 1)] - [(x^2 - 4x + 4) + (y^2 - 6y + 9)] = 11 ]
Simplify:
Combine like terms:
Step 3: Substitute and Solve for and
Now substitute into either original equation. Let's use the first:
Expand and simplify:
Multiply everything by 16 to clear the fractions:
Solve this quadratic equation using the quadratic formula:
where , , and :
Calculate:
Now find corresponding values:
For , .
For , .
Points of Intersection
The points of intersection are approximately:
Would you like more details, or do you have any other questions?
Related Questions:
- How do you find the intersection points of two general circles?
- What is the geometric interpretation of subtracting two circle equations?
- How does completing the square help in solving circle equations?
- How would you solve these equations graphically?
- What are the implications if the circles do not intersect?
Tip: When working with circles, converting equations into standard form using completing the square is a powerful technique for simplifying and solving problems.
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Math Problem Analysis
Mathematical Concepts
Circle Equations
Completing the Square
Quadratic Equations
Formulas
Quadratic equation formula
Theorems
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Suitable Grade Level
High School
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