Question

h) The function is decreasing on the interval(s) Type your answer in interval notation. Round two decimal places as needed.

Answer 1

Step 1

Given;

Step 2

$y=3x\left(x^2-9\right)\left(x+6\right)$

Thus it is increasing at;

$(-4.85,-1.50)\cup(1.85,\infty)$

It is decreasing at;

$(-\infty,-4.85)\cup(-1.50,1.85)$

Answer;