How would you solve these?

3. State the intervals of increase for y = f(xx) given f'(x) = -3x(x - 2)(x + 1). A -1 2 B-1 2 6. Which must be true for a minimum to 11. Differentiate. occur at x = a ony =f(xx)? a) y = (2x2 - 1)3(x#+ 3)5 Af(a) > 0 b) f (x ) = 6.x + 5 V7 - 3x2 Bf(a) 0 d) h(x) = -3-4x Df(a) 0 13. Where is this function discontinuous? Justify your answer. DJ(a) 3 14. Use first principles to determine the derivative of f(x) = 2x x - 3