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y = x³ - 9x
m = y' = 3x² - 9
Maka, pada:
a. P(1,-8)
m = 3(1)² - 9
m = 3-9
m = -6
Maka garis singgungnya adalah:
b. Q(0,2)
m = 3(0)² - 9
m = 0-9
m = -9
Maka garis singgungnya adalah: