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melalui (x1,y1) dan gradien m --> y - y1 = m(x - x1)
gradien garis 4x + 2y + 1 = 0 --> m1 = -4/2 = - 2
gradien garis singgung = m2 = m1 = - 2 (sejajar)
m2 = y'
2x +8 = -2
x = -5 , sub ke y = x² +8x + 1
y = - 14
a) titik itu = titik singgung
titik singgung (x1,y1) =(-5, - 14)
b) persamaan garis singgung
(x1,y1) = (-5, -14) , m = -2
y + 14 = -2(x + 5)
y = -2x -10 - 14
y = -2x - 24
2x + y + 24 = 0