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[RobertScheitlin__GISP]

Is this question about 4.x or 3.x?

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[RobertScheitlin__GISP · Accepted solution]

Ian,

   You execute the same queriy again but this time use the executeForExtent method

https://developers.arcgis.com/javascript/latest/api-reference/esri-tasks-QueryTask.html#executeForEx... 

and union the resulting extent of the first extent query with the second.

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[RobertScheitlin__GISP]

Ian,

   Nice. Don't forget to mark this question as answered by clicking on the "Mark Correct" link on the reply that answered your question.