Fd the intervals of increase and decrease for fx 6x3

Question

1. Find the intervals of increase and decrease for f(x) = 6x³ + 54x² - 228x - 7

a. Increasing on x ≤ -2 and x ≥ 8 , decreasing on  - 2 ≤ x ≤ 8

b. Increasing on x < -8 and x > 2, decreasing on -8 < x < 2

c. Increasing on -8 < x < 2, decreasing on x < -8 and x > 2

d. Increasing on x < -2 and x > 8, decreasing on -2 < x < 8

2. An equation for the tangent line to the curve y = (3x² + x - 1)⁹at the point where x = 0 is

a. y = 9x - 1

b. y = 18x + 1

c. y = 9x + 1

d. y = 18x - 1