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y = (-1)³ + 4(-1)² - 3(-1) - 5
y = - 1 + 4 + 3 - 5
y = 1
f' (x) = 3x² + 8x - 3
m = f '(- 1) = 3 (-1)² + 8 (-1) - 3
m = 3 - 8 - 3
m = - 8
pers grs singgung
y - y1 = m (x - x1)
y - 1 = - 8 (x - - 1)
y - 1 = - 8 (x + 1)
y - 1 = - 8x - 8
8x + y - 1 + 8 = 0
8x + y + 7 = 0