Answer:
6x
Step-by-step explanation:
Given that a function f(x) is given as

A) 
Now divide by delta x

B) When delta x tends to 0, this becomes

(NOte: This is the derivative of f(x))
Answer:
a₄ = - 15
Step-by-step explanation:
Using the recursive formula and a₁ = 17 , then
a₂ = a₁ - 8 = 17 - 8 = 9
a₃ = a₂ - 8 = 9 - 8 = 1
a₃ = a₂ - 8 = 1 - 8 = - 7
a₄ = a₃ - 8 = - 7 - 8 = - 15
To subtract? as minus means subract/take away?