Question

What is the center of the circle represented by this equation? (x – 7)2 + (y + 4)2 = 9 A) (4, 9) B) (2, 3) C) (-7, 9) D) (7, -4)

Answer 1

(7, - 4 )

Explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) is the centre and r the radius

(x - 7)² + (y + 4)² = 9 ← is in standard form

with (h, k) = (7 - 4) ← centre