diketahui fungsi f(x) = x3-3x2-24x+5 interval x agar fungsi turun

Kelas 11 Matematika
Bab Turunan

f(x) = x³ - 3x² - 24x + 5

Turun

f'(x) < 0
3x² - 6x - 24 < 0
x² - 2x - 8 < 0
(x - 4) (x + 2) < 0
x - 4 < 0
x < 4

x + 2 > 0
x > -2
-2 < x

Interval -2 < x < 4