Arsenal secured 3 points against West Ham to remain on the fifth sport of the premiership table.
After a quiet first half, Mesut Ozil, on his 150th appearance for the Gunners, fired home from the edge of the box after being gifted possession by Jose Fonte.
And the German, after playing a one-two with Alexis Sanchez, crossed for Theo Walcott – captain for the day in the absence of the injured Laurent Koscielny – to turn home from eight yards out.
And substitute Olivier Giroud curled in a fantastic third after being picked out by fellow substitute Alex Oxlade-Chamberlain.
Arsenal rediscover form at crucial time
The Gunners had only won one and drawn another in their past six Premier League games, to leave their hopes of Champions League qualification – having reached the last 17 tournaments – in real jeopardy.
There were more protests against long-serving manager Arsene Wenger – with some Gunners fans not taking their seats until the 13th minute. It has been 13 years since they last won the league.
But it did not distract the team too much, admittedly against opposition in even worse form than themselves.
Arsenal had the best of the first half, but it was after the break they took control of the game.
Hammers keeper Darren Randolph was unhappy with Ozil’s opener as he felt Sanchez was offside and blocking his view, but referee Martin Atkinson did not care for his appeals.
The two Gunners stars both linked up to set up Walcott’s second, and then Giroud scored the game’s outstanding goal to clinch the match. The French striker, who replaced Danny Welbeck, has scored more Premier League goals as a substitute than anyone else this season – five.
Arsenal should have had a penalty in injury time when Sam Byram brought down Nacho Monreal.