Question

What is the value of a for the following circle in general form? X^2+y^2+ax+by+c=0 graph inlcuded

Answer 1

well the radius is 4

Answer 2

is that what a stands for?

Answer 3

Circle whose center is at the origin
Equation: x^2 + y^2 = r^2

Circle whose center is at (h,k)
Equation: (x - h)^2 + (x - k)^2 = r^2

Answer 4

so what does the a represent in the general form?

Answer 5

well first you have to find (h,k)

Answer 6

(-3,1) i believe

Answer 7

no (h,k) = (3,-1)
then plug it into the equation
(x - 3)^2 + (x + 1)^2 = 4^2
(x- 3)(x-3) + (x+ 1)(x+1) = 16
x^2 - 6x + 9 + x^2 + x + 1 = 16
2x^2 - 5x + 10 = 16
x^ 2 + y^2 + 2x^2 - 5x - 6 = 0
that would be your general form

Answer 8

so its 2?