Question

A circle has its center at (-2, -3) and a radius of 3 units. What is the equation of the circle?

(x + 2)2 + (y - 3)2 = 9

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

(x + 2)2 + (y + 3)2 = 9

(x + 2)2 + (y + 3)2 = 3

Answer 1

@robtobey please help

Answer 2

what do you think is the answer?

Answer 3

the general form of the equation is

(x - a)^2 + (y - b)^2 = r^2

where center = (a,b) and radius = r

Answer 4

I dont understand this

Answer 5

its either a or c

Answer 6

so if you compare this with the above options you'll find the correct one

Answer 7

is it c?

Answer 8

well substitute a = -2 and b = -3 and r = 3 into the general form and you'll get the correct option

Answer 9

lets try the first part (x - a)^2

a = -2 , so we have

(x -(-2))^2 = (x + 2)^2

now do the same for b and r

Answer 10

do you see what i am doing?

Answer 11

yep, so my answer is c:)

Answer 12

right

Answer 13

thank you

Answer 14

yw