Question

What are the center and radius of the circle defined by the equation x^2 + y^2 -6x + 4y + 4=0

Answer 1

The equation of a circle:

`(x-h)^2+(y-k)^2=r^2`

(h, k) - a coordinates of the center

r - a radius

`x^2+y^2-6x+4y+4=0\ \ \ |-4\\\\x^2-2\cdot x\cdot3+y^2+2\cdot y\cdot2=-4\ \ \ |+3^2\ |+2^2\\\\\underbrace{x^2-2\cdot x\cdot3+3^2}_((a-b)^2=a^2-2ab+b^2)+\underbrace{y^2+2\cdot y\cdot2+2^2}_((a+b)^2=a^2+2ab+b^2)=-4+3^2+2^2\\\\(x-3)^2+(y+2)^2=3^2`

Answer:

the center: (3, -2)

the radius: 3