Question

For $a x ^ { 2 } + 2 h x y + 3 y ^ { 2 } + 4 x + 8 y - 6 = 0$ to represent a circle, one must have.

• A. $a = 3 , h = 0$
• B. $a = 1 , h = 0$
• C. $a = h = 3$
• D. $a = h = 0$

Answer 1

Answer: (A)

$a = 3 , h = 0$

Answer 2

It is obvious.