To solve this problem, it's important to understand the concept of increasing and decreasing intervals in a function. This involves the use of derivatives in calculus.
Here's the usual step-by-step process:
1. Start by finding the derivative of the function. The derivative will help us understand the slope at different points on the curve of the function.
2. Once the derivative is obtained, set it equal to zero and solve for x. The points where derivative equals zero are often called "critical points."
3. When you have the critical points, you end up dividing the number line into several intervals.
4. Choose any point from each interval (that does not include the critical points) and substitute into the derivative.
5. If the derivative is positive at that value, this means that the original function is increasing in that interval. If the derivative is negative at that value, then the function is decreasing in that interval.
However, without detailed information or form of the function, we cannot execute these steps or provide the exact intervals where the function is increasing or decreasing. More details about the function are needed to provide an accurate solution.