Let $A(t) = 3 - 5t^3 \cdot 4 \cdot 2^t$. Find $A(2) - A(1)$.
A(2) = 3 - 40 x 4 x 4 = 3 - 640 = -637.
A(1) = 3 - 5 x 4 x 2 = 3 - 40 = -37
-637 - ( - 37 ) = -637 + 37 = -600
Answer: -600
