tentukan intervesial fungsi turun y=x³-6x²+9x+1

Kelas 11 Matematika
Bab Turunan

y = x³ - 6x² + 9x + 1

Turun

y' < 0
3x² - 12x + 9 < 0
x² - 4x + 3 < 0
(x - 1) (x - 3) < 0

x - 3 < 0
x < 3

x - 1 > 0
x > 1
1 < x

1 < x < 3