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syarat tegak lurus ms = - (ms = m grs singgung)
= -
= - 2
ms = f'(x)
- 2 = 2x - 2
2x = - 2 + 2
2x = 0
x = 0
y = x² - 2x - 3
= 0² - 2 . 0 - 3
= 0 - 3
= - 3
titik singgung (0 , - 3) deengan m = - 2
persamaan garis singgung
y - b = m (x - a)
y - - 3 = - 2 (x - 0)
y + 3 = - 2x
2x + y + 3 = 0