A(x)=2x^3+5
A(2) =2(2)^3+5
A(2) =2(8)+5 (Raising 2 to the power of 3)
A(2) =16+5 (Multiplying)
A(2) = 21 (Adding)
A(4) =2(4)^3+5
A(4) =2(64)+5 (Raising 4 to the power of 3)
A(4) =128 +5 (Multiplying)
A(4) = 133 (Adding)
A(4)•A(2)= 133 *21 = 2793
The answer is 2793.