I don't need explanations I just want the clear answer

16. Which best describes the characteristics for the graph of f(x) = -5x4 + 3x2 + x - 1? a. The graph primarily increases in the first and third quadrants. b. The graph primarily decreases in the second quadrant and increases in the first quadrant. c. The graph primarily increases in the third quadrant and decreases in the fourth quadrant. d. The graph primarily decreases in the second and fourth quadrants 17. The function g(x) = x3 + 4x2 + 1 is only increasing throughout which of these intervals? a. -0o ,x = -1