Arsenal manager Arsene Wenger says the 3-0 win against Manchester United was the perfect response to the mid-week defeat in the Champions League.
The Gunners produced one of the most impressive performances of the season as they eased past the Red Devils at the Emirates.
They move up to second in the table, just two points from leaders Manchester City.
"I believe in the [first half] we started very strong and decided to press very high and play with great pace, and we did that very well," Wenger told reporters.
"After in the second half we decided to be disciplined, control the result and we did that very well. We had two aspects in our game that was pleasing and we were convincing today. It gives us a strong answer to all the questions raised in the week.
"We won last year in a very important FA Cup game at Old Trafford, so we won last year. For us it was a massive game when we were in the FA Cup.
"It is true that they won here last year and it is true as well that for a few years in the Premier League we did not win against them but it just shows if you turn up with the right performance you win.
"We are in it [the title race], we are two points off the league leaders, Manchester City, so I hope that result today will give us belief to fight for it.
"My plan is to pray now that everyone comes back from international games without any injury because we have a small group. We play at Watford straight away and on Tuesday night here against Bayern Munich. We will need the same kind of performance.
"He [Alexis Sanchez] has a little groin problem. Unfortunately he goes to Chile.
"You cannot stop him from going to Chile and he loves so much to play for his country and he will play against Brazil [on Friday] and Peru [next] Tuesday so the game at home against Brazil he will not want to miss. Hopefully he will come back in good shape."
