free kick out of bounds

[Patton]

Rule 6-1-8...A free kick shall not be kicked out of bounds between the goal lines untouched inbounds by R. If it is, R has the following choices.

a. Accept a 5-yard penalty from the previous spot and have K rekick.

b. Put the ball in play at the inbounds spot 25 yards beyond the previous spot.

c. Decline the penalty and put the ball in play at the inbounds spot.

So to answer your question, the ball will be placed at the inbounds spot if R chooses (b) or (c). If they choose (a), K can free kick from anywhere between the inbounds spots after the 5-yard penalty.