What is thw radius of a circle given by the equation x^2+y^2-2x+8y-47=0
1 answer:
x^2 + y^2 - 2x + 8y - 47 = 0
x^2 + y^2 - 2x + 8y = 47
(x^2 - 2x) + (y^2 + 8y) = 47
(x^2 - 2(1)x) + (y^2 + 2(4)y) = 47
(x^2 - 2(1)x + 1^2) + (y^2 + 2(4)y + 4^2) = 47 + 1^2 + 4^2
(x - 1)^2 + (y + 4)^2 = 64 = 8^2
r=8
You might be interested in
Answer:
dude im in 8th grade and im getting college math no wonder i have a D-
Step-by-step explanation:
Answer:
-4,-1
i have to put 20 character so here is 20 characters
Which question in order for me 2 answer
Answer: (x + 2) (x - 2)
Step-by-step explanation:
His average speed in kilometers per hour is 8