Arsenal s Brazilian midfielder Gabriel Martinelli (R) fights for the ball with Bournemouth s English midfielder Marcus Tavernier (C) during the English Premier League football match between Bournemouth and Arsenal at the Vitality Stadium in Bournemouth, southern England on August 20, 2022. AFP
The Norway playmaker converted a rebound in the fifth minute after Gabriel Martinelli's shot was saved and then lashed in a rising effort from Gabriel Jesus' lay-off.
Center back William Saliba curled in a third goal from the edge of the area with his weaker left foot to clinch another convincing win, after 2-0 at Crystal Palace in the opening round and 4-2 at home to Leicester last weekend.
It contrasts to last season, when Arsenal opened with three straight losses to leave Mikel Arteta's job under threat.
Arsenal is the only team to start with a maximum nine points. Manchester City will also look for a third straight win when the defending champions play at Newcastle on Sunday.
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