The question requires you to use the value of x as 2 in the expression.
This means where there is x in the expression, replace it with 2 then perform the operation.
So, given the expression as :
x^3 + 7x + 2
2^3 + 7*2 + 2
[2*2*2] + [7*2] + 2
8 + 14 + 2
24
Answer
24