Question

Xpangkat4+Xpangkat3-12<0=.......
Tolonglah..

Answer 1

Let's solve your inequality step-by-step.

x4+x3−12<0

Let's find the critical points of the inequality.

x4+x3−12=0

(Use quartic formula)

x=−2.171664,1.653657

Check intervals in between critical points. (Test values in the intervals to see if they work.)

x<−2.171664(Doesn't work in original inequality)

−2.171664<x<1.653657(Works in original inequality)

x>1.653657(Doesn't work in original inequality)

Answer:

−2.171664<x<1.653657