Coming off their divisional win over the Cowboys, the Eagles stayed at home for a Week 9 Monday night duel with the Chicago Bears.  Philadelphia trailed early in the first quarter as Bears quarterback Jay Cutler completed a 5-yard touchdown pass to tight end Matt Spaeth.  Chicago would add onto their lead in the second quarter as kicker Robbie Gould booted a 51-yard field goal.  The Eagles answered with a 47-yard field goal from rookie kicker Alex Henery. followed by rookie linebacker Brian Rolle returning a fumble 22 yards for a touchdown, but the Bears would close out the half with running back Marion Barber getting a 2-yard touchdown run. Philadelphia took the lead the third quarter with a 4-yard touchdown run from running back Ronnie Brown, followed by a 33-yard touchdown run from running back LeSean McCoy.  Chicago replied with Gould making a 38-yard field goal.  Afterwards, the Bears retook the lead with Cutler completing a 5-yard touchdown pass to wide receiver Earl Bennett, followed by Gould getting a 22-yard field goal.  The Eagles tried to rally, including an unsuccessful fake punt by Chas Henry, but Chicago's defense held on to preserve the win.
Question: How many yards longer was Gould's field goal in the second quarter?
Answer: 4