Question

Find the center and radius of x^2+y^2+2x-10y+10=0

Answer 1

"complete the square"
\[x^2+2x+y^2-10y=-10\]
\[(x+1)^2+(y-5)^2=-10+1+25=16\] now read off the answer from the general form
\[(x-h)^2+(y-k)^2=r^2\]

Answer 2

so the center would be 1 and -5 and the radius would be 16

Answer 3

no

Answer 4

\[r^2=16,r=4\]

Answer 5

\[(x-h)^2+(y-k)^2=(x+1)^2+(y-5)^2\]
\[h=-1,k=5\]

Answer 6

ok thanks for explaining.

Answer 7

yw