Question

Help Me...
Number 4
Thank you^^

Answer 1

X² + y² + 4x + ky - 12 = 0 melalui (-2,8)
(-2)² + 8² + 4(-2) + k(8) - 12 = 0
4 + 64 - 8 + 8k - 12 = 0
8k = -48
k = -6
x² + y² + 4x - 6y - 12 = 0
Pusat (a, b) = (-1/2 A, -1/2 B) = (-1/2 . 4, -1/2 . -6) = (-2, 3)
jari-jari = √(a² + b² - C) = √((-2)² + 3² - (-12)) = √(4 + 9 + 12) = √25 = 5