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Verified answer
Jawabx² +y² - 4x -6y - 12= 0
(x - 2)² +(y-3)² = 25
titik (x1,y1) = (-2,0) pada lingkaran
persamaan garis singgung
(x1- a)(x-a) + (y1-b)(y-b) = r²
(-2-2)(x - 2) +(0-3)(y-3)= 25
-4(x -2) -3(y-3)= 25
-4x + 8 - 3y + 9 = 25
-4x - 3y = 8
4x+ 3y = - 8
4x + 3y + 8 = 0