Answer:
a)
Step-by-step explanation:
(f(2+h) - f(2))/h =
(3(2+h)² - 3×2²)/h =
(3(4 + 4h + h²) - 12)/h =
(12 + 12h + 3h² - 12)/h =
(12h + 3h²)/h = 12 + 3h = 3h + 12
