Answer:
ZERO
Step-by-step explanation
Write the given function as
F(x) = ax + b
i.e Y = ax + b
now differentiate Y with respect to X
dY/dX = d (ax + b)/ dx
dY/dX = a
now again differentiate this function with respect to x
so, d^2Y/dX^2 = d^2 (a)/dX^2
= 0 (ZERO)
note: differentiation of constant function is zero
