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Verified answer
JawabOrdinat = y = 3
(x - 2)² + (y + 1)² = 25
(x - 2)² + (3 + 1)² = 25
x = 5
Titik singgung = (x,y) = (5,3)
PGSL dg titik singgung (p,q) = (5,3) dan pusat = (a,b) = (2,-1) :
(p - a)(x - a) + (q - b)(y - b) = r²
(5 - 2)(x - 2) + (3 - (-1))(y - (-1)) = 25
3(x - 2) + 4(y + 1) = 25
3x + 4y - 27 = 0