matematika kelas 11 harap bantu

P(-5,4) ----->> a = -5, b = 4
Q(2,3)

r² = (2 - (-5))² + (4 - 4)²
r² = (2 + 5)² + (4 - 4)²
r² = 7² + 0²
r² = 49 + 0
r² = 49

Jadi,
Persamaan lingkarannya adalah:
(x - a)² + (y - b)² = r²
(x - (-5))² + (y - 4) = 49
(x + 5)² + (y - 4) = 49
x² + 10x + 25 + y² - 8y + 16 = 49
x² + y² + 10x - 8y + 41 = 49
x² + y² + 10x - 8y - 8 = 0