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P (-1,3) --> a= -1,b = 3
maka
L : (x+1)² + (y-3)² = r²
mell (x =3, y=6)
maka
r² = (3+1)²+(6-3)²
= 4²+3²
= 25
sehigga
L : (x+1)² + (y-3)² = 25
(x²+2x+1) + (y²-6y+9) = 25
x²+y²+2x-6y+1+9-25 = 0
x²+y²+2x-6y-15 = 0