Question

The standard equation of a circle with center (h,k) and radius r is given by (x-h)^2 + (y-k)^2 =r^2. Write the equation of a circle with center (0,0) and radius 3.

Answer 1

put the numbers into the equation.

Answer 2

(x-0)^2 + (y-0)^2=9

Answer 3

okay, simplify.

Answer 4

idk how

Answer 5

what happens when you subtract 0?

Answer 6

it stays the same. so y^2 + x^2=9

Answer 7

yeah

Answer 8

is that the answer?

Answer 9

or do i set it equal to 0?

Answer 10

no, it's fine

Answer 11

ok. Thank You!