The interval where the function is concave upward is (-∝, 1)
How to determine the intervals the function is concave upward
from the question, we have the following parameters that can be used in our computation:
The graph
From the graph, we have the following
Increasing interval = (-1.5, 1)
This is because the y values increase as x increase
Decreasing interval = (-∝, -1.5) and (1, ∝)
This is because the y values decrease as x increase
Also, we have
Concave interval = (-∝, 1)
This is because the function takes a U-shape at this interval