Question

Is the given point interior, exterior, or on the circle (x + 2)^2 + (y - 3)^2 = 81?

P(8, 4)

Answer 1

can you get the center and the radius of the circle from the equation ?

Answer 2

@hoblos Yes. The center is (2,-3) and the radius is 81, right?

Answer 3

or is the radius 9^2?

Answer 4

it's close but not 100% correct

the general formula of a circle with center (a,b) and radius r is

(x-a)² + (y-b)² = r²

Answer 5

r² = 9²

thus r= ?

Answer 6

81?

Answer 7

oh wait, no the radius is 9

Answer 8

yeahh now it's correct

now what about the center ?

Answer 9

(x-2)^2+(y-3)^2

Answer 10

sooo (x-4) + (y-9) right?

Answer 11

Well thanks anyway, i gtg. I appreciate it tho!

Answer 12

what is the answer that you got ?

Answer 13

It was exterior.