Question

已知圆C:(x-1)?+(y+2)?=10求满足下列条件的圆的切线方程

Answer 1

C(1,-2),r=√10

(1)

x+y+m=0

|1-2+m|/√2=r=√10

m=

(2)

2x+y+m=0

|2*1-2+m|/√2=√10

m=

(3)

k(CA)=1/3,-1/k(CA)=3

y+1=3*(x-4)