Learn Swedish: Vi utbytte åsikter om rubriken innan redaktören bytte ut den. - We exchanged opinions about the headline before the editor replaced it.

This perfectly shows the difference between inseparable compound verbs and separated particle verbs! Att utbyta (to exchange) is abstract, like exchanging ideas or opinions. Att byta ut (to replace or swap out) is a concrete, literal action. As a rule of thumb in Swedish, the inseparable prefix form of a verb is abstract, while the separated particle form is literal.

How is the inseparable verb utbyta conjugated here in the past tense?

The past tense is utbytte. When a particle is permanently attached to the front of a verb to form a new abstract verb, you simply conjugate the verb root at the end as you normally would. Since byta becomes bytte in the past tense, utbyta becomes utbytte.

Why is the preposition om used after åsikter?

The noun åsikt (opinion) almost always pairs with the preposition om when stating what the opinion concerns. While English sometimes uses 'opinions on', Swedish prefers åsikter om.

Why does the sentence end with den?