Question

Find the equation of a cirde passing (2,-1) and concentric with 5x² +5y² - 12x + 12y - 420=0​

Answer 1

Answer:

Concentric means having common centre

Centre of the circle = (6,-6)

Given point = (2,-1)

Radius = distance b/w center and point

== By distance formula

Radius = √41

Equation of circle:

(x-h)² + (y-k)² = r²

(x-6)² + (y+6)² = 41

or x²+y²-12x+12y -41 = 0