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Verified answer
Jawab8x² +8y² + 64 x - 48 y - 138 = 0.... bagi 8
x² + y² + 8x - 6y - 17,25 =0
(x² + 8x) + (y² -6y)= 17,25
(x +4)² + (y- 3)² = 17,25 + 8² + 3²
(x+ 4)² + (y - 3)² = 361/4 --> (x - a)² + (y - b)² = r²
a = - 4
b = 3
r²= 361/4
Pusat (a ,b) = (- 4, 3)
r = √(361/4) = 19/2= 9,5