Math Problem Statement

Express (x - 11)^2 + (y + 13)^2 = 25 in general form.

Solution

The given equation is:

(x11)2+(y+13)2=25(x - 11)^2 + (y + 13)^2 = 25

This represents the equation of a circle in standard form, where the center is (h,k)=(11,13)(h, k) = (11, -13), and the radius is 25=5\sqrt{25} = 5.

To convert this into the general form, we will expand both binomials and rearrange terms.

Step-by-step solution:

  1. Expand the binomials: (x11)2=x222x+121(x - 11)^2 = x^2 - 22x + 121 (y+13)2=y2+26y+169(y + 13)^2 = y^2 + 26y + 169

  2. Substituting these expansions back into the equation: x222x+121+y2+26y+169=25x^2 - 22x + 121 + y^2 + 26y + 169 = 25

  3. Combine like terms: x222x+y2+26y+121+169=25x^2 - 22x + y^2 + 26y + 121 + 169 = 25 x222x+y2+26y+290=25x^2 - 22x + y^2 + 26y + 290 = 25

  4. Move everything to one side to form the general equation: x222x+y2+26y+29025=0x^2 - 22x + y^2 + 26y + 290 - 25 = 0 x222x+y2+26y+265=0x^2 - 22x + y^2 + 26y + 265 = 0

This matches the first option in the image.

Thus, the correct answer is:

x222x+y2+26y+265=0x^2 - 22x + y^2 + 26y + 265 = 0

Let me know if you need further clarification or details!

Related Questions:

  1. How do you derive the standard form of a circle from the general form?
  2. What is the geometric interpretation of the general form of a circle?
  3. How can you determine the radius of a circle given its general form?
  4. What is the process to find the center of a circle from its equation?
  5. How do we convert a quadratic equation in two variables into standard form?

Tip: Always check if the constants in your equation match both sides when simplifying!

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Math Problem Analysis

Mathematical Concepts

Algebra
Equation of a Circle
Standard and General Form

Formulas

(x - h)^2 + (y - k)^2 = r^2 (Equation of a circle in standard form)
General form of a quadratic equation in two variables: Ax^2 + By^2 + Cx + Dy + E = 0

Theorems

Expansion of Binomials
Equation of a Circle

Suitable Grade Level

Grades 9-11