Kerjakan soal yang ada di bawah ini !
x² + y² - 4x + 2y = 0
(x² - 4x + 4) + (y² + 2y + 1) = 4+1
(x-2)² + (y+1)² = 5
titik (4,-2) = (x1,y1)
rumus PGS
(x-a)(x1-a) + (y-b)(y1-b) = r²
(x-2)(4-2) + (y+1)(-2+1) = 5
2(x-2) + (y+1).-1 = 5
2x-4-y-1 = 5
2x-4-5 = 5
2x-y-10=0 (e)
[answer.2.content]
