Question

A circle is defined by the following equation:
x^(2)+y^(2)-8x+14y+47=0
What are the coordinates of its center?

Answer 1

(4,-7) :P

Answer 2

How did you get that so fast?

Answer 3

magic :p

Answer 4

Okay magician, a circle is defined by the following equation:
3x^(2)+3y^(2)+30x+30y+150=0
What is its radius?

Answer 5

now the radius takes a little longer lol

Answer 6

x^2 +Y^2 +10X + 10Y + 50 =0

X^2 +10X+25 +Y^2 + 10Y + 25 + 50 =0

(X+5)^2 +(Y+5)^2 +50 =0

Answer 7

wait

Answer 8

should be (x+5)^2 +(y+5)^2 =0, WHICH IS NOT A CIRCLE

Answer 9

So then is 0 not the answer?

Answer 10

how can u have a circle of zero radius :P

Answer 11

a small one :)

Answer 12

idk, i have this as a qustion. it doesn't make sence.

Answer 13

teacher made a mistake

Answer 14

It's a computer program though.

Answer 15

well, its not a circle , a sum of sqaures cannot be zero ( in the real numbers anyway )

Answer 16

well, its not a circle , a sum of sqaures cannot be zero ( in the real numbers anyway )

Answer 17

the answer is definately not zero

Answer 18

would you say it is 10?

Answer 19

no

I would say its not a circle