Posted by allison-please help!!! on .
Solve the following inequality.
x^3+9x^2-108 less or equal to 0.
Then write your solution in interval notation. I am sooo confused and do not have any idea how to do this. Can someone please show me step by step please???
Thanks in advance. Someone who is confused.
college algebra -
This polynomial graphing might help sometimes:
zeros at x = -6 (double zero) and x = +3
so we really have
It is negative for large negative x
it comes up and bounces off the x axis at x=-6, dropping down negative again
it does not actually come up and cross the x axis until x = 3
from then on it is positive,
therefore negative for
x</= +3 except for touching zero at x = -6