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Mathematics · JEE | CONIC SECTIONS

हिन्दी

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The equation \( x^2 + y^2 - 4x - 8y - 45 = 0 \) represents a circle. Reason (R): Any second-degree equation in two variables \( x \) and \( y \) always represents a circle if the coefficients of \( x^2 \) and \( y^2 \) are equal and non-zero. In the light of the above statements, choose the correct answer from the options given below:

  1. A
    Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. B
    Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
  3. C
    (A) is true but (R) is false.
  4. D
    (A) is false but (R) is true.
View Answer & Solution

Correct answer · Option C

(A) is true but (R) is false.

Explanation

Assertion (A) is true as completing the square yields a circle with real radius. Reason (R) is false because a general second-degree equation requires additional conditions (like absence of an \( xy \) term and positive radius squared) to represent a circle.
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