-24
-66+42
=-24 since it is negative
The critical points are at x = 1 and x = 4 giving you the intervals (-inf, 1), (1, 4) and (4, inf).
By substituting x values in these 3 intervals, you can see that f'(x) is positive in the first and third intervals and negative in the second interval.
This means that f(x) is increasing in the first and third intervals and decreasing in the second interval.
The answer is D.
It’s going from least to greatest. For the first problem on the hundreds side it would be
225
437
572
732
Hope this helps
