college algebra--need help please!!
posted by Heather on .
write the standard form of the equation and the general form of the equation of the circle with radius r and center (h,k)
Given: C(h,k) = C(8,-6), r = 10.
STD Form: (x-h)^2 + (y-k)^2 = r^2.
(x-8)^2 + (y+6)^2 = 100.
x^2-16x+64 + y^2+12y+36-100 = 0.
X^2 + Y^2 -16x + 12y - 64 = 0
Gen. Form: X^2 + Y^2 Ax + By + C = 0.