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m = y' = 4x³ + 8x
mel (1,9)
x = 1, m = 4.1³ + 8.1 = 12
persamaan garis singgung
y - 9 = 12(x - 1)
y - 9 = 12x - 12
y = 12x - 3
garis y = 12x - 3
tipot garis y, x = 0
y = 12.0 - 3 = -3
titik potong (0, - 3)