Complete in 30 min please. I'll leave a

Question 7 Determine where the function f (x) = 5x3 + 2x + 8 is concave up and concave down. O Concave down on (-0o, co) O Concave up on (-00, oo) Concave down on (0, co) and concave up on (-co, 0). Concave up on (0, co) and concave down on (-oo, 0) . Question 8 Determine where the function f (x) = -x3 + 6x + 2 is concave up and concave down. O Concave down on (0, co) and concave up on (-0o, 0) O Concave up on (0, oo) and concave down on (-00, 0) O Concave down on (2, co) and concave up on (-co, 2) O Concave down on (-0o, co)