If f(x)= + 3

Question

If f(x)=  + 3 
- 24x + 8,then f is
A) decreasing on (-∞, 4), concave up on (-1, ∞), and has no relative minimum point. 
B) decreasing on (1, 2), concave up (0, ∞), and has a relative minimum when x = -4. 
C) increasing on (2, ∞), concave up on (-∞, -1), and has a relative minimum when x = 2. 
D) increasing on (-4, 2), concave down on (-∞, ∞), and has a relative maximum when x = 2. 
E) decreasing on (-4, 2), concave down on (-∞, -1), and has a relative maximum when x = -4.

Quizplus · Accepted Answer

The Answer of If f(x)=  + 3 
- 24x + 8,then f is
A) decreasing on (-∞, 4), concave up on (-1, ∞), and has no relative minimum point. 
B) decreasing on (1, 2), concave up (0, ∞), and has a relative minimum when x = -4. 
C) increasing on (2, ∞), concave up on (-∞, -1), and has a relative minimum when x = 2. 
D) increasing on (-4, 2), concave down on (-∞, ∞), and has a relative maximum when x = 2. 
E) decreasing on (-4, 2), concave down on (-∞, -1), and has a relative maximum when x = -4.