Question

What is the equation of this circle in general form? https://static.k12.com/nextgen_media/assets/8097030-NG_GMT_W_01_U12_Quiz_04.png

x2+y2−8x−10y+25=0

x² + y² + 8x + 10y + 25 = 0

x² + y² + 8x + 10y + 37 = 0

x2+y2−8x−10y+37=0

Answer 1

any idea ? do you know what is the general equation of a circle ?

Answer 2

old question but will address this so this can be closed

start with (x-h)^2 + (y-k)^2 = r^2
where r = the radius of the circle, and (h,k) are the coordinates of the center

then expand the terms in parentheses w/ FOIL
subtract the r^2 value from both sides so you have 0 on the right side
combine like terms
then see which answer choice matches