Im sure ive tired this problem 1000 ways and cant get it right help?

Question

A force f vector = (4x i + 4y j ) N acts on an object as it moves in the x direction from the origin to x = 5.06 m. Find the work W = integral( f vector·dr ) done by the force on the object.

Answer 1

Because the object moves only in the x direction, the y force drops out of the dot product and all you have to do is integrate 4x·dx along the path.