Eksperten forklarer svaret.

Because -en is the definite ending for many masculine singular nouns in Norwegian.

• en ekspert = an expert
• eksperten = the expert

Unlike English, Norwegian usually attaches the definite article to the end of the noun instead of putting a separate word like the in front.

Svaret is the definite form of svar.

• et svar = an answer
• svaret = the answer

Here, the sentence is talking about a specific answer, not just any answer, so the definite form is used.

That is because the nouns belong to different grammatical genders.

• ekspert is usually masculine: en ekspert → eksperten
• svar is neuter: et svar → svaret

In Norwegian Bokmål, the definite singular ending is often:

• masculine: -en
• neuter: -et
• feminine: often -a or sometimes -en, depending on style and dialect

Forklarer is the present tense of å forklare (to explain).

So:

• å forklare = to explain
• forklarer = explains / is explaining

In Norwegian, the present tense often ends in -er for many verbs.

It can mean both, depending on context.

Norwegian often uses the simple present where English might use either:

• explains
• is explaining

So Eksperten forklarer svaret could mean:

• The expert explains the answer
• The expert is explaining the answer

The larger context tells you which one sounds most natural.

This is the normal basic Norwegian word order in a main clause:

Subject + Verb + Object

So here:

• Eksperten = subject
• forklarer = verb
• svaret = object

This is the same basic order as in English:

• The expert explains the answer

Very often, yes. Norwegian commonly marks definiteness by adding an ending to the noun:

• en bil = a car
• bilen = the car

But sometimes you will also see a separate word before the noun, especially with adjectives:

• bilen = the car
• den røde bilen = the red car

So in simple noun phrases with no adjective, the definite ending on the noun is usually enough.

Yes, grammatically you could, but the meaning changes.

• Eksperten forklarer svaret = The expert explains the answer
• En ekspert forklarer et svar = An expert explains an answer

The original sentence points to a specific expert and a specific answer. Your version would sound much less specific.

Often, but not always in exactly the same situations. In this sentence, it matches English very well.

• å forklare noe = to explain something

So:

• forklarer svaret = explains the answer

Depending on context, Norwegian may sometimes use forklare where English might prefer describe, clarify, or account for, but explain is the most direct meaning.

A rough pronunciation guide is:

eks-per-ten for-KLAR-er SVA-ret

A few helpful notes:

• x in Eksperten sounds like ks
• r in Norwegian is usually clearly pronounced
• sv in svaret is pronounced together, somewhat like sva-
• the stress is usually on klar in forklarer

Exact pronunciation varies by dialect, but that rough guide will help you get started.

No, not normally. Norwegian usually requires an explicit subject in ordinary sentences.

So you say:

• Eksperten forklarer svaret

You would not normally just say:

• Forklarer svaret

unless it is in a very special context, like notes, headlines, or fragments. In normal speech and writing, the subject is usually stated.

Because Norwegian usually builds the into the noun itself.

Compare:

• English: the expert, the answer
• Norwegian: eksperten, svaret

So the meaning of the is already included in those noun endings. That is why you do not need a separate article in this sentence.