NEED MAJOR HELP! *QUADRATIC EQUATIONS*
posted by Adrianna on .
Write the equation for the circle with center at ( 8,  6) and radius of 10.
(x+8)² + (y + 6)² = 10
(x+8)² + (y + 6)² = 100
(x8)² + (y  6)² = 100
Find the standard equation for the circle with center on the positive xaxis and passing through the origin with radius of 2.
x² + y² = 4
(x + 2)² + y² = 4
(x  2)² + y² = 4
Choose the appropriate description for the equation.
Given: 10(x  3)2 + 10(y + 4)2 = 100
circle
pointcircle
no circle
Choose the appropriate description for the equation.
Given: (x  2)2 + (y + 3)2 = 49
circle
pointcircle
no circle
Write the equation for the circle with center at (1,  2) and passing through the origin.
(x  1)² + (y + 2)² = 0
(x  1)² + (y + 2)² = 5
(x  1)² + (y + 2)² = 25
Choose the appropriate description for the equation.
Given: x2 + y2 = 0
circle
pointcircle
no circle
Write the equation for the circle with center at (6,0) and radius of 6.
(x  6)² + y² = 36
(x + 6)² + y² = 36
(x  6)²  y² = 36
Write the equation for the circle with center at (0,0) and radius of 4.
x² + y² = 4
x²  y² = 16
x² + y² = 16

What is your questions about this test?
It is really easy.
if a,b is the center of a circle of radius r, then the equation is
(xa)^2+(yb)^2=r^2
You should memorize that. 
It probably would be easy, but I don't have a teacher teaching me this. I do all my school work online and I just need this class to finish and graduate.