The word GOD in that verse is elohim, which is the plural form of GOD (el).
i've heard that everywhere the Bible uses this plural word referring to God, the verb tense associated with it is singular. (putting to rest any objection that God is not one God).
have also heard that in Hebrew the plural form of words is sometimes used for emphasis of importance -- that it doesn't always mean the subject is a quantity of more than one.
can someone who actually knows Hebrew verify or correct this?
and maybe comment whether it could just be the case that the Hebrew pronoun is in plural form, but doesn't necessarily mean the intended meaning is plurality?
i poked around a bit and it looks like Jewish sources generally interpret the plurals here and in the rest of the first couple chapters of Genesis to refer to 'the council of heaven' and Christian sources generally interpret this to be a reference to trinity. it seems possible that it may be neither, maybe just an artifact of the language that doesn't have a direct correlation in English, sort of like using the royal "we" that simply speaks of the majesty of the speaker, not the plurality.
or maybe i'm butchering the language because i know nothing abut Hebrew