how do you find the diameter of a circle using the equation x^2+y^2+8x-22y-88=0? I need it step by step please
2 answers:
Check attached image file.
You can complete the square on x and y terms to find the radius:-
x^2 + 8x + y^2 - 22y - 88 = 0
(x + 4)^2 - 16 + (y - 11)^2 - 121 - 88 = 0
(x + 4)^2 + (y - 11)^2 = 121 + 88 + 16 = 225
(x + 4)^2 + (y - 11)^2 = 225
compare this with the standard form:-
( x - a)^2 + (y - b)^2 = r^2 where r = radius
So radius = sqrt225 = 15
Diameter = 2*15 = 30 Answer
You might be interested in
1.D, both.
not sure of the other though
Answer:
f(x) = 1,200 * (0.97)ˣ
Step-by-step explanation:
Answer:
72 yd^3
Step-by-step explanation:
That is 5*20 is 100 and the inverse of 5 is 25
Answer:
im pretty sure B 7.5 units
Step-by-step explanation: