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m = y' = 3x² - 8x + 2
untuk x = 1 -> m = -3
pers garis singgung di (1, -4)
y - y1 = m(x - x1)
y + 4 = -3(x - 1)
titk potong dgn sumbu x , y = 0
0 + 4 = -3x + 3
3x = 3 - 4
x = -1/3
tik pot (x, y) = (- 1/3, 0)